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Background Human epidermal growth factor 2 (HER2) is an effective therapeutic target in breast cancer; however, resistance to anti-HER2 agents such as trastuzumab and lapatinib develops. In a preclinical model, an HDAC inhibitor epigenetically reversed the resistance of cancer cells to trastuzumab and showed synergistic efficacy with lapatinib in inhibiting growth of trastuzumab-resistant HER2-positive (HER2+) breast cancer. Methods A phase 1b, dose escalation study was performed to assess maximum tolerated dose, safety/toxicity, clinical efficacy and explored pharmacodynamic biomarkers of response to entinostat combined with lapatinib with or without trastuzumab. Results The combination was safe. The MTD was lapatinib, 1000 mg daily; entinostat, 12 mg every other week; trastuzumab, 8 mg/kg followed by 6 mg/kg every 3 weeks. Adverse events included diarrhoea (89%), neutropenia (31%), and thrombocytopenia (23%). Neutropenia, thrombocytopenia and hypokalaemia were noted. Pharmacodynamic assessment did not yield conclusive results. Among 35 patients with evaluable response, PR was observed in 3 patients and CR in 3 patients, 1 maintained SD for over 6 months. Discussion This study identified the MTD of the entinostat, lapatinib, and trastuzumab combination that provided acceptable tolerability and anti-tumour activity in heavily pre-treated patients with HER2+ metastatic breast cancer, supporting a confirmatory trial.

There is a clinical need to predict sensitivity of metastatic hormone receptor-positive and HER2-negative (HR+/HER2−) breast cancer to endocrine therapy, and targeted RNA sequencing (RNAseq) offers diagnostic potential to measure both transcriptional activity and functional mutation. We developed the SETER/PR index to measure gene expression microarray probe sets that were correlated with hormone receptors (ESR1 and PGR) and robust to preanalytical and analytical influences. We tested SETER/PR index in biopsies of metastastic HR+/HER2− breast cancer against the treatment outcomes in 140 patients. Then we customized the SETER/PR assay to measure 18 informative, 10 reference transcripts, and sequence the ligand-binding domain (LBD) of ESR1 using droplet-based targeted RNAseq, and tested that in residual RNA from 53 patients. Higher SETER/PR index in metastatic samples predicted longer PFS and OS when patients received endocrine therapy as next treatment, even after adjustment for clinical-pathologic risk factors (PFS: HR 0.534, 95% CI 0.299 to 0.955, p = 0.035; OS: HR 0.315, 95% CI 0.157 to 0.631, p = 0.001). Mutated ESR1 LBD was detected in 8/53 (15%) of metastases, involving 1−98% of ESR1 transcripts (all had high SETER/PR index). A signature based on probe sets with good preanalytical and analytical performance facilitated our customization of an accurate targeted RNAseq assay to measure both phenotype and genotype of ER-related transcription. Elevated SETER/PR was associated with prolonged sensitivity to endocrine therapy in patients with metastatic HR+/HER2− breast cancer, especially in the absence of mutated ESR1 transcript., SCOPUS: ar.j, info:eu-repo/semantics/published

3108 Background: Selinexor (KPT-330) is potent inhibitor of Exportin-1. In vitro, Selinexor was found to be synergistic with eribulin in triple negative breast cancer (TNBC) cell lines and enhanced antitumor activity of eribulin in TNBC patient-derived xenografts (PMID 28810913). Methods: We conducted a phase Ib trial in combination of selinexor and eribulin using 3 + 3 design in dose escalation for patients with advanced solid tumors and in TNBC in dose expansion cohort. Eribulin could be discontinued after combination for 6 cycles at physician discretion. Primary objectives: Safety, Recommended Phase 2 Dose (RP2D). Secondary Objectives: Objective Response Rate (ORR), Duration of Response (DOR), Disease Control Rate (DCR), Overall Survival (OS) and Progression Free Survival (PFS). Results: 31 patients, TNBC (n = 19), sarcoma (n = 8), others (n = 4) enrolled in dose escalation (n = 10) and dose expansion phases (n = 21). Median prior therapies:4 (1–6). Study initiated selinexor at 60mg twice weekly and eribulin 1.4mg/m2 on Day1, Day8 every 3 weeks which led to 1 Dose Limiting Toxicity (DLT) and hence, selinexor 80mg once weekly and eribulin 1mg/m2 was elected as RP2D due to efficacy and tolerability. As of 01/15/2022, of 29 patients (94%) who have discontinued treatment, 24 (77%) were due to progressive disease, 3 (10%) withdrew consent and 2 (6%) due to toxicities (G1 pneumonitis; G3 neutropenia) while 2 (6%) remain on trial. All 31 patients had at least one treatment emergent adverse event (TEAE) while most prevalent TEAEs (all grades) were leukopenia (77%), nausea (71%), anemia and neutropenia (68%) and fatigue (48%). The most common G3/4 TEAE were leukopenia (26%) and neutropenia (29%). 2 DLTs occurred; 1 in first dose level (DL); 1 in second DL dosed at selinexor 80 mg once weekly due to G3 neutropenia. ORR for all was 10% while DCR (SD+PR+CR) > 6 months seen in 3 (15%) TNBC and 2 (20%) sarcoma patients. The median OS and PFS for all were 12.3 (7.3, 27.3) months and 2.3 (1.6, 4.1) months. In dose escalation cohort, ORR was 10% where one patient (3%) with vaginal SCC had confirmed PR (-44%) for 2.1 months. Five patients (62.5%) with sarcoma had stable disease (SD). One patient with high grade sarcoma has SD for 68 months and remains on selinexor after 4 months of eribulin and selinexor. In TNBC dose expansion (n = 19), ORR was 10.5% with 2 confirmed PRs and median duration of response (DOR) of 10.8 months. One patient who has remained on treatment for 18 months, and after receiving 8 months of eribulin and selinexor, remains on selinexor with 100% target regression and an indeterminate brain lesion. Conclusions: Selinexor with eribulin is safe with manageable toxicity profile and modest overall clinical efficacy. Durable responses and disease control were observed with metastatic TNBC. Further study is needed to examine the determinants of response to this combination. Clinical trial information: NCT02419495.

Background Imatinib mesylate is a potent inhibitor of the Abl, KIT and platelet derived growth factor (PDGF) receptor tyrosine kinases. Preclinical data suggest that combining imatinib mesylate with anti-estrogen therapy may be synergistic in hormone receptor-positive breast cancer. We report results of the first phase II trial evaluating the efficacy of the novel combination of imatinib mesylate and letrozole in the treatment of postmenopausal women with metastatic breast cancer. Patients and Methods 45 postmenopausal women with hormone receptor-positive metastatic breast cancer whose tumors demonstrated c-kit and/or PDGFR-β positivity were treated with imatinib mesylate 400 mg PO twice daily and letrozole 2.5 mg PO once daily until disease progression or unacceptable toxicity. Results There were no complete responses and five partial responses for an objective response rate of 11%. An additional 16 patients had stable disease lasting at least 24 weeks for a clinical benefit rate of 46.7%. The median progression-free and overall survival was 8.7 months (95% confidence interval: 3.8-11.4 months) and 44.3 months (95% confidence interval: 34.0-55.3 months), respectively. The most common grade 3 or higher treatment related adverse events were fatigue and diarrhea, occurring in 9 (20%) and 7 patients (16%), respectively. Conclusion The combination of imatinib mesylate and letrozole is well tolerated but appears to have limited efficacy in the treatment of hormone receptor-positive metastatic breast cancer.

Background: Neoadjuvant chemotherapy (NACT) is an integral component for locally advanced and large operable breast cancer. The sequence of taxanes followed by anthracyclines has been the standard of care for almost 20 years. Eribulin (E) is a synthetic analogue of halichondrin B with distinct mechanism of action as microtubule dynamics inhibitor. The FDA approved E in 11/2010 for the treatment of patients (pts) with metastatic breast cancer who have previously received at least two chemotherapeutic regimens for the treatment of metastatic disease. Research Hypothesis: Sequential administration of eribulin followed by FAC/FEC-regimen, would have greater pathologic complete response (pCR) rate than sequential administration of paclitaxel followed by FAC/FEC-regimen as primary systemic therapy for woman with operable breast cancer. Methods: This is a phase II, randomized, single institution, open label study. Pts were randomized 1:1 to receive E (1.4 mg/m2 d1 and d8 q 21 days x 4) or paclitaxel (P) (80 mg/m2 weekly x12). Both arms received FAC/FEC regimen x 4 doses followed by surgery. Eligible pts were women age 18 or older, Karnosfky PS 80 – 100, histologically confirmed invasive breast cancer, clinical T2-T3, N0-3, M0, HER2-negative. Baseline LVEF of > 50% and normal hematology, liver and kidney laboratory function tests. Primary endpoint was pathologic complete response (pCR/RCB-0) assessed by residual cancer burden (RCB). [Symmans F, 2007]. This protocol (2012-0167) IRB of The University of Texas, MD Anderson Cancer Center. Results: A preplanned interim analysis aimed to validate trial assumption was conducted after treatment of 54 randomized pts. Between 8/2012 to 7/2014, 54 pts were randomized and 49 were evaluable for pCR(27 P arm and 22 E arm). Tumor response by RCB is shown in the table. pCR rates were 30% and 4.5% in the P and E arm, respectively. Table 1.ResponsePaclitaxel - FAC/FEC Arm (N=27)Eribulin - FAC/FEC Arm (N=22)RCB 0 (pCR)8 (30%)1 (4.5%)RCB I6 (22.2%)1 (4.5%)RCB II9 (33%)10 (45%)RCB III4 (14.8%)10 (45%) 53 pts were evaluable for toxicity. The combination was safe with mostly grade 1 and 2 toxicities in both arms. In the P arm grade 3 peripheral neuropathy and neutropenia was seen in 3% and 7%, respectively. In the E arm one patient died due to multiorgan failure during cycle 1. There was no other grade 3-5 toxicity. Biomarker analysis using CTCs by AdnaTest Breast were evaluated in 39 pts at baseline. 5/39 pts were positive for CTCs. 3 pts had transcripts for EpCAM, 1 for Muc-1 and another had both. 30 pts had an additional sample post therapy. 2 pts were positive for CTC at baseline as well as at follow up (FU) visit at 180 days. None of the samples showed CTC-EMT at baseline or at FU visits. Conclusions: The interim analysis demonstrated that E arm lead to significantly lower pCR/RCB1 rate compared to P arm. Ongoing biomarker analyses include TIL, hot spot mutation analysis (HSMA) and molecular inversion probes (MIP) will be presented at the time of the meeting. Clinical trial information: NCT01593020. Citation Format: Alvarez RH, Koenig KB, Ensor JE, Ibrahim NK, Chavez-MacGregor M, Litton JK, Schwartz Gomez JK, Cyriac A, Krishnamurty S, Caudle AS, Shaitelman SF, Whitman GJ, Booser DJ, Reuben JM, Valero V. A randomized phase II neoadjuvant (NACT) study of sequential eribulin followed by FAC/FEC-regimen compared to sequential paclitaxel followed by FAC/FEC-regimen in patients (pts) with operable breast cancer not overexpressing HER-2. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P1-14-04.

Background: Our in vitro and in vivo preclinical data showed that entinostat enhances the efficacy of lapatinib in HER2 positive (HER2+) breast cancer cells via FOXO3-mediated Bim1 expression, which resulted in enhanced apoptosis in HER2 targeted therapy (lapatinib and trastuzumab)-resistant breast cancer (IBC and non-IBC) cells [Lee et al.]. Based on these findings, we conducted a phase 1b trial of entinostat to determine the maximal tolerated dose (MTD) in combination with lapatinib alone and in combination with lapatinib and trastuzumab for metastatic HER2+ breast cancer patients (pts), who progressed on trastuzumab. Method: This was a single-center, open-label phase 1b study to evaluate the dose limiting toxicity (DLT) and determine MTD. 3+3 dose escalation schedule was used for Cohorts 1 and 2. Pts received lapatinib and entinostat (Cohort 1) or entinostat, lapatinib, and trastuzumab (Cohort 2). Initial dose of lapatinib 1250mg in Cohort 1 and 1000mg for Cohort 2 to match standard dose in combination with trastuzumab dose. In Cohort 1, entinostat was given PO on day 1 and 15 every 28 days cycle at dose levels 10 mg (level 0), 12 mg (level 1), or 15 mg (level 2). The dose levels for Cohort 2 were 12 mg (co-level 0) or 15 mg (co-level 1) on day 1 and 15 every 28 days cycle. While lapatinib and entinostat were given 28 days cycle due to entinostat dosing, the dosing of trastuzumab followed approved schedule every 21 days starting at 8mg/kg loading followed by 6mg/kg q 3 wks in Cohort 2 and 3. After the MTD of entinostat in cohort 2 was determined at 12mg, an expansion cohort of 10 pts (cohort 3) was conducted. Results: Median age was 52 (26-69 yrs). Median number of prior trastuzumab-based regimens was 2 (1-6), 8 pts had lapatinib containing treatment prior to the trial, including 5 pts who had clinical benefit. 16 had ER+ and 13 ER negative, and 9 had IBC. Clinical efficacy and toxicity of treatment is summarized in table 1. Out of 14 pts who had clinical benefit (CR, PR, SD), 6 had IBC. Three pts are still on therapy (1CR, 1PR, 1SD). Table 1. Clinical Efficacy, Toxicity of combination Receptor StatusResponseGrade 3 toxicityGrade 4 toxicityCohort 1HER2+/ER- (N=8) HER2+/ER+ (N=7)CR (N=1; 8M), SD (N=4;1,2,4M)Lapatinib dose reduction: 3 pts Rash (2) Abdominal pain + dyspnea (1)Entinostat dose reduction: 2pts Neutropenia (1 at 12mg, 1 at 15mg)Cohort 2/3HER2+/ER- (N=8) HER2+/ER+ (N=6)CR (N=2; 3,6M), PR (N=2;4,5M) SD (N=5;1,2,4,6M)Lapatinib dose reduction: 2 pts Diarrhea (N=1 at 12mg N=1 at 10mg) Entinostat dose reduction: 5 pts Neutropenia (N=2 at 12 mg) Leukopenia (N=1 at 12mg) Anemia (N=1 at 12mg)Entinostat dose reduction: 2pts Hypokalemia (N=1 at 12mg) Thrombocytopenia (N=1 at 15mg)CR: complete response, PR: partial response, SD: stable disease, N=number of pts, M=months Conclusion: MTD was reached at 12mg q 2wkly entinostat, lapatinib 1000 mg daily and trastuzumab 8 mg/kg followed by 6mg/kg q 3 wks. This combination was safe and had promising clinical efficacy in patients with trastuzumab-resistant metastatic HER2+ breast cancer including IBC, warranting further study. Citation Format: Lim B, Jackson S, Alvarez RH, Ibrahim NK, Willey JS, Murthy RK, Booser DJ, Giordano SH, Barcenas CH, Brewster A, Walters RS, Brown PH, Tripathy D, Valero V, Ueno NT. A single-center, open-label phase 1b study of entinostat, and lapatinib alone, and in combination with and trastuzumab in patients with HER2+ metastatic breast cancer after progression on trastuzumab. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P4-14-22.

Background: Approximately 30% of TNBCs are characterized by microarray as claudin-low, mesenchymal or mesenchymal stem cell-like and, unlike basal TNBCs, these tumors frequently harbor aberrations in the PI3K/AKT/mTOR axis, raising the possibility of targeting this axis to enhance chemotherapy response. Assays to clinically identify mesenchymal TNBCs are under development, but published results confirm that up to 30% are metaplastic breast cancers (MpBCs), a chemo-refractory group of tumors that contain a mixture of epithelial and mesenchymal components, making them identifiable by microscopy. As such, MpBCs serve as surrogates of response for potential regimens to treat mesenchymal TNBC. Methods: Patients (pts) with advanced TNBC (N=64) were treated with liposomal doxorubicin (D), bevacizumab (A) and the mTOR inhibitors temsirolimus (T) or everolimus (E). D and A were administered IV on day 1 with T (IV on days 1, 8 and 15) or E (continuous daily oral administration) using 21 day cycles. Response was assessed every 6 weeks using RECIST. When available, archived tissue was evaluated for aberrations in the PI3K pathway using standard assays. Results: Fifty-two MpBC pts were treated with DAT (N=39) or DAE (N=13). Median age was 58 (range 37-79); median # of prior regimens for metastatic disease was 1 (range 0-5). The objective response rate (ORR) was 21% [complete response (CR)=4 (8%); partial response (PR)=7 (13%)] and 10 (19%) pts had stable disease (SD)≥6 months for a clinical benefit rate (CBR) of 40%. Tissue was available for testing in 43 pts and 32 (74%) had a PI3K pathway activating aberration (Table 1). Response According to PI3K Pathway AberrationPI3K Pathway AberrationN (%)CRPRSD≥6monthsCBRORRAny PI3K Pathway Aberration*32 (74)46444%31%PIK3CA Mutation19 (59)23447%26%p.H1047R12 (38)21350%25%p.E545K6 (19)02150%33%p.G1007R1 (3)010100%100%p.E545A1 (3)0000%0%p.H1047Y1 (3)0000%0%p.K111E1 (3)0000%0%p.E542K1 (3)0000%0%PIK3CA Amplification1 (3)010100%100%PTEN Mutation5 (16)0000%0%PTEN Loss5 (16)02040%40%AKT1 p.E17K Mutation2 (6)0000%0%AKT2 Amplification1 (3)100100%100%PIK3R1 Mutation2 (6)01050%50%NF2 Mutation1 (3)100100%100%No PI3K Pathway Aberration11 (26)00545%0%*Some tumors had >1 aberration detected PI3K pathway activation was associated with a significant improvement in ORR (31 vs 0%; P=0.043) but not CBR (44 vs 45%; P=1.000) or progression-free survival (median 5.1 vs 2.9 months; P=0.352). A pt with 5 year+ durable CR (on maintenance everolimus) had a mutation in NF2. To emphasize the importance of pt selection, it is notable that 12 pts with non-metaplastic TNBC were also treated with DAT, and only 1 pt had a response (CR/PR=1; SD≥6 months=0), for a CBR that was significantly worse than pts with MpBC (8 vs 40%; P=0.045). Conclusions: Using MpBC as a surrogate of response, DAT/DAE has significantly better activity in mesenchymal compared to non-selected TNBC. Response is enhanced in pts with PI3K pathway activation. DAT/DAE should be tested in non-metaplastic, mesenchymal TNBC once a diagnostic assay is available. Citation Format: Basho RK, Gilcrease M, Murthy RK, Helgason T, Booser DJ, Karp DD, Meric-Bernstam F, Wheler JJ, Valero V, Albarracin C, Litton J, Chavez-MacGregor M, Ibrahim NK, Murray JL, Koenig KB, Hong D, Subbiah V, Kurzrock R, Janku F, Moulder S. Targeting the PI3K/AKT/mTOR pathway for the treatment of mesenchymal triple-negative breast cancer (TNBC): Evidence of efficacy and proof of concept from a phase I trial with dose expansion of mTOR inhibition in combination with liposomal doxorubicin and bevacizumab. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P3-14-02.

Background: Our preclinical data show that entinostat enhances the efficacy of lapatinib in HER2 positive (HER2+) breast cancer cell lines via FOX-03-mediated Bim1 expression. In-vitro and in- vivo, the combination of entinostat and lapatinib enhanced apoptosis in lapatinib-resistant cells. We conducted a phase I study with the primary objective to determine the RP2D of entinostat plus lapatinib in patients with HER2+ metastatic breast cancer with progressive disease (PD) after trastuzumab treatment. Methods: This was a single-center, open-label study to evaluate the dose limiting toxicity (DLT) and determine the MTD of every-other-week entinostat plus daily lapatinib in 28-day cycles. Patients with locally recurrent or metastatic breast cancer in whom trastuzumab had failed were enrolled. DLT was defined as: any toxicity resulting in 14 or more days of treatment delay, febrile neutropenia (NTP), grade 4 NTP for over 7 days, any grade 3 or higher non-hematologic toxicity, grade 3 nausea, vomiting, diarrhea or electrolyte imbalance lasting over 48 hours despite adequate supportive care, or a platelet count less than 10,000. Grading was assigned according to common toxicity criteria (CTC 4). A standard 3+3 dose escalation design was used. Entinostat was given at 10 mg (level 0), 12 mg (level 1), or 15 mg (level 2) by mouth every 14 days. Lapatinib was given at 1250 mg by mouth daily. Toxicity was evaluated on day 15 and day 28 for C1 and C2, and at the end of each cycle thereafter. Results: Fifteen patients with HER2+ metastatic breast cancer were enrolled. Median age was 52 years (range 26-69), median of all prior systemic treatment was 4 (range 1- 12), and median prior trastuzumab-based regimens was 2 (range 1-6). Eight patients had prior lapatinib exposure. Seven patients had ER+/HER2+ tumors. Median number of cycles completed was 2 (range 1-13). DLT was observed in 0 of 3 patients at level 0, 1 of 6 at level 1, and 1 of 6 at level 2. 3 patients at level 1 had lapatinib dose reductions because of grade 3 rash (n=2) or grade 3 dyspnea (n=1) or grade 3 abdominal pain (n=1). 2 patients at level 2 had entinostat dose reductions because of grade 4 NTP in cycle 1 (n=1) or grade 3 NTP in cycle 5 and grade 4 neutropenia in cycle 6 (n=1). Five patients had SD (defined per 2009 RECIST guidelines): two at dose level 1 for 6 months and 13 months, three at level 2 for 3, 4, and 8 months. Median time to progression was 2 months (range 1-13). The most common treatment related adverse events were fatigue (n=15), myalgia (n=14), nausea (n=14), diarrhea (n=13), anemia (n=11), and rash (n=11). Conclusion: MTD was not reached. Cumulative toxicity of entinostat plus lapatinib was fairly well tolerated. The combination therapy suggests there was clinical activity in at-least 5 patients who had SD in this cohort of heavily pretreated trastuzumab-resistant MBC. Data from the EG104900 clinical trial showed that lapatinib plus trastuzumab significantly improved median overall survival compared with lapatinib alone. Therefore, this study was modified after 15 patients to add trastuzumab to the combination. We are currently conducting a phase 1b trial to determine the MTD of entinostat, trastuzumab and lapatinib. Citation Format: Jie Willey, Ricardo H Alvarez, Daniel J Booser, Sharon H Giordano, Ana M Gonzalez-Angulo, James L Murray, Vincente Valero, Jangsoon Lee, Naoto T Ueno, Summer A Jackson, Fahad A Faruqi. A phase I clinical trial of entinostat and lapatinib in patients with trastuzumab refractory HER2-positive metastatic breast cancer [abstract]. In: Proceedings of the Thirty-Seventh Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2014 Dec 9-13; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2015;75(9 Suppl):Abstract nr P5-19-22.

110 Background: Cancer-related-fatigue (CRF) is the most debilitating symptom in patients with advanced cancer. Physical activity (PA) improves CRF with lower adherence in advanced cancer. Dexamethasone (Dex) improves CRF but has long-term side effects. The purpose of the study was to determine whether a brief course of Dex improves adherence to PA for CRF management. Methods: Advanced cancer patients with CRF ≥ 4/10 on Edmonton Symptom Assessment Scale (ESAS) were eligible. Patients were randomized to either 4mg of Dex (LoDex) or 8mg of Dex (HiDex) orally BID for 7 days Plus standardized aerobic and resistance exercise for 4 weeks. Change in the Functional Assessment of Chronic Illness-Fatigue (FACIT-F) fatigue subscale from baseline to Day 8 (primary outcome) and Day 29 were assessed. Secondary outcomes included changes in fatigue (ESAS, PROMIS, MFSI), Sleep Quality (PSQI), fasting blood glucose, and myopathy. Results: Total evaluable patients were 60 (31 LoDex and 29 HiDex arms). The study was feasible (N = 60/67 were evaluable); 84% and 65% LoDex, and 96% and 68% Hi Dex were adherent to aerobic and resistance exercise, respectively [All Patients were adherent to study medication]. There was no significant difference in grade 3+ AE’s between the two arms (P = 0. 92). The FACIT fatigue subscale Cohen’s d in Lo Dex was 0.90 (P < 0.001) and 0.94(P < 0.001); and Hi Dex was 0.86(P < 0.001); and 1.05(P < 0.001) at Day 8 and Day 29, respectively. Similar improvement was found for ESAS Fatigue (P < 0.001), MFSI total (P = 0.005), and PROMIS –fatigue total (P = 0.005). Mixed model analysis showed significant improvement in FACIT-F fatigue scores at Day 8 (P = 0.0006), Day 15 (P = 0.0002), and D (P = 0.0018). There was no significant difference between the two arms at Day 8 and Day 29 in fatigue scores, myopathy, fasting blood glucose levels, symptom distress, and sleep quality scores. Conclusions: Short course of dexamethasone Plus physical activity resulted in sustained and robust improvement in CRF outcomes for upto 3 weeks after discontinuation of steroids suggesting possible priming effects of steroids helped to sustain physical activity. Further larger studies are justified. Clinical trial information: NCT02491632.

Bone is the most common site of metastasis of breast cancer, affecting most women with advanced disease. Procollagen type I N-terminal propeptide (P1NP), osteocalcin, CTX, and IL-6 are markers of bone turnover. Our objective was to determine whether serum levels of these proteins have clinical utility as predictors of breast cancer metastasis to bone. Blood was collected before treatment from 164 patients with stage I-III breast cancer from September 2001 to December 2008. Serum levels of P1NP, CTX, IL-6, and OC were measured using an automated immunoassay system. Correlations of the levels of these markers with time to bone metastasis development and with overall survival (OS) rate were assessed using Cox proportional hazards regression analysis and the Kaplan-Meier method. Fifty-five patients with stage I-III disease at the time of blood sample collection subsequently experienced metastasis to bone. A baseline P1NP level of at least 75 ng/mL predicted increased risk of bone metastasis (hazard ratio, 2.7 [95 % confidence interval, 1.2-6.0]; P = 0.031) and a poor OS rate (P = 0.031). Serum P1NP levels at or above 75 ng/mL correlate with a short time to development of bone metastasis and low overall survival in patients with stage I-III breast cancer.

Purpose: Our goal was to examine whether borderline estrogen receptor (ER)-positive cancers, defined as 1–10% positivity by immunohistochemistry (IHC), show the same global gene expression pattern and high ESR1 mRNA expression as ER-positive cancers or are more similar to ER-negative cancers. Patients and methods: ER status was determined by IHC in 465 primary breast cancers and with Affymetrix U133A gene chip (ESR1 mRNA gene expression: Probe set = 205225_at). We compared expressions of ESR1 mRNA and a 106-probe set ER-associated gene signature score between ER-negative (n=183), 1–9% (n=25), exactly 10% (n=6), and > 10% ER-positive (n=251) cancers. We also assessed the molecular class of the borderline ER-positive cases using the PAM-50 classifier. Results: Among the 1–9%, 10% and > 10% IHC positive cases, 24%, 67% and 92% were also ER-positive by ESR1 mRNA expression. The average ESR1 expression was significantly higher in the > 10% IHC-positive cohorts compared to the 1–9% or completely negative cases but in these latter two cohorts ER expression was similarly low. The average ER gene signature scores were similar for the ER-negative and 1–9% IHC-positive cases, but significantly lower than in > 10% ER-positive cases. None of the 1–9% ER-positive cases were classified as Luminal A, 2 were Luminal B and 12 were Basal-like. Among the 10% ER-positive cases, 2 were Luminal A and 1 was Luminal B. Conclusion: Overall, 24% of the 1–9% and 67% of the 10% ER-positive cancers show ESR1 mRNA levels and gene signatures that are consistent with ER-positive, potentially endocrine sensitive tumors. Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P1-07-09.

BACKGROUND: Inhibition of mammalian target of rapamycin with everolimus may improve the efficacy of taxanes. Everolimus and docetaxel are both metabolized by CYP3A4, which could result in a pharmacokinetic (PK) interaction. METHODS: Fifteen patients with metastatic breast cancer were treated with docetaxel (doses of 40-75 mg/m2 intravenously on day 1 of a 21-day cycle) in combination with everolimus (doses ranging from 20 to 50 mg orally on days 1 and 8 of a 21-day cycle) in a phase 1 trial using the continuous reassessment method to determine maximum tolerated dose. The first 2 patients developed a dose-limiting toxicity (neutropenic infection), prompting a mandatory dose reduction and PK evaluation of both everolimus and docetaxel for patients enrolled in subsequent dosing cohorts. RESULTS: Fifteen patients were treated. Dose-limiting toxicity included grade 3 mucositis (n = 1), prolonged grade 4 neutropenia (n = 1), and grade 3 infection/febrile neutropenia (n = 3). Day 8 of everolimus was commonly held for neutropenia despite a dose reduction in docetaxel to 40 mg/m2. Eleven patients underwent complete PK evaluation for everolimus, and 9 patients underwent complete PK evaluation for both everolimus and docetaxel. Widely variable changes in clearance were seen for both drugs, and the study was terminated because of lack of efficacy and concerns regarding toxicity seen with the combination. CONCLUSIONS: Weekly everolimus in combination with docetaxel every 3 weeks was associated with excessive neutropenia and variable clearance of both drugs, making combination therapy unpredictable, even at low doses of both drugs. Cancer 2012. © 2011 American Cancer Society.

Several oncologic and cardiovascular organizations have recommended routine left ventricular ejection fraction (LVEF) evaluation for all patients prior to anthracycline chemotherapy for breast cancer. Nevertheless, there is no clinical or cost-effective evidence in support of such practice. Clinical

Purpose Bone-targeted radiation therapy is an attractive strategy for addressing bone disease with minimal systemic toxicity. This pilot study was designed to determine the safety and efficacy of 166Holmium (Ho)-DOTMP for irradiating malignant cells and adjacent marrow in women with bone-only metastatic breast cancer. Patients and Methods Subjects included 6 women aged ≤ 65 years with breast cancer and bone-only metastases at M. D. Anderson Cancer Center. The activity of 166Ho-DOTMP was calculated to deliver a therapeutic absorbed dose of 22 Gy (n = 3) or 28 Gy (n = 3) to the marrow. Treatment was followed by autologous stem cell transplantation to circumvent the anticipated myelosuppresion. Median follow-up time was 40 months. Results All subjects showed prompt hematologic recovery. No patient experienced grade 3/4 acute toxicity aside from myelosuppression. Two patients developed hemorrhagic cystitis 2 years after therapy. One patient developed myelodysplastic syndrome but was found to have had pre-existing trisomy 8. Two patients remained progression free without evidence of disease for more than 6 years. Five women experienced disease relapse (4 at extraosseous sites) and died of progressive disease. Median time to progression was 10.4 months. Conclusion The approach of bone-targeted radiation therapy with 166Ho-DOTMP had an acceptable toxicity profile, and sustained complete response was obtained in 2 of 6 patients. We are conducting a phase II study to evaluate the efficacy of targeted skeletal radiation therapy for treating bone-only metastases.

There is limited prognostic information to identify breast cancer patients who are at risk for late recurrences after adjuvant or neoadjuvant systemic therapy (AST). We evaluated the residual risk of recurrence and prognostic factors of 2838 patients with stage I–III breast cancer who were treated with AST between January 1, 1985, and November 1, 2001, and remained disease free for 5 years. Residual recurrence-free survival was estimated from the landmark of 5 years after AST to date of first recurrence or last follow-up using the Kaplan–Meier method. The log-rank test (two-sided) was used to compare groups. Residual recurrence-free survival rates at 5 and 10 years were 89% and 80%, respectively, and 216 patients developed a recurrence event. The 5-year residual risks of recurrence for patients with stage I, II, and III cancers were 7% (95% confidence interval [CI] = 3% to 15%), 11% (95% CI = 9% to 13%), and 13% (95% CI = 10% to 17%), respectively (P = .02). In multivariable analysis, stage, grade, hormone receptor status, and endocrine therapy were associated with late recurrences. Breast cancer patients have a substantial residual risk of recurrence, and selected tumor characteristics are associated with late recurrences.

Background Mesenchymal/metaplastic breast cancers (MpBCs) are often triple-negative (TNBC), and chemo-refractory, and can harbor phosphoinositide 3-kinase (PI3kinase) alterations; thus, therapy with mTor inhibitors may demonstrate activity. Patients and methods Patients with mesenchymal/MpBC treated with temsirolimus-based regimens were evaluated. Mutational analyses [polymerase chain reaction (PCR)-based DNA sequencing method, mass spectrometric detection (Sequenom MassARRAY), or next-generation sequencing] as well as loss of phosphatase and tensin homolog (PTEN) (immunohistochemistry) were performed (archived tissue when available). Results Twenty-three patients (one of whom was on two separate trials) were treated using temsirolimus-containing regimens: temsirolimus alone (n = 1 patient) or combined with the following: liposomal doxorubicin and bevacizumab (DAT, n = 18); liposomal doxorubicin (DT, n = 1); paclitaxel and bevacizumab (TAT, n = 2); paclitaxel (TT, n = 1); carboplatin and bevacizumab (CAT, n = 1). Response rate [complete response (CR) + partial response (PR)] was 25% across all regimens; 32% in the anthracycline-based regimens [DAT and DT (CR = 2, PR = 4; N = 19)]. An additional two patients achieved stable disease (SD) ≥6 months [total SD ≥6 months/CR/PR = 8 (33%)]. Molecular aberrations in the PI3K pathway were common: PIK3CA mutation = 6/15 (40%), PTEN mutation = 3/11 (27%), and PTEN loss = 2/11 (18%). A point mutation in the NF2 gene (K159fs*16; NF2 alterations can activate mTor) was found in one patient who attained CR (3+ years). Of the eight patients who achieved SD ≥6 months/CR/PR, all 4 patients with available tissue had a molecular aberration that activate the PIK3CA/Akt/mTOR axis: PIK3CA mutation = 2; PTEN loss = 1; NF2 aberration = 1. Conclusions DAT has activity in MpBCs including complete CRs. Molecular aberrations that can activate the PI3 K/Akt/mTOR axis are common in MpBC.

Purpose We developed a multigene predictor of pathologic complete response (pCR) to preoperative weekly paclitaxel and fluorouracil-doxorubicin-cyclophosphamide (T/FAC) chemotherapy and assessed its predictive accuracy on independent cases. Patients and Methods One hundred thirty-three patients with stage I-III breast cancer were included. Pretreatment gene expression profiling was performed with oligonecleotide microarrays on fine-needle aspiration specimens. We developed predictors of pCR from 82 cases and assessed accuracy on 51 independent cases. Results Overall pCR rate was 26% in both cohorts. In the training set, 56 probes were identified as differentially expressed between pCR versus residual disease, at a false discovery rate of 1%. We examined the performance of 780 distinct classifiers (set of genes + prediction algorithm) in full cross-validation. Many predictors performed equally well. A nominally best 30-probe set Diagonal Linear Discriminant Analysis classifier was selected for independent validation. It showed significantly higher sensitivity (92% v 61%) than a clinical predictor including age, grade, and estrogen receptor status. The negative predictive value (96% v 86%) and area under the curve (0.877 v 0.811) were nominally better but not statistically significant. The combination of genomic and clinical information yielded a predictor not significantly different from the genomic predictor alone. In 31 samples, RNA was hybridized in replicate with resulting predictions that were 97% concordant. Conclusion A 30-probe set pharmacogenomic predictor predicted pCR to T/FAC chemotherapy with high sensitivity and negative predictive value. This test correctly identified all but one of the patients who achieved pCR (12 of 13 patients) and all but one of those who were predicted to have residual disease had residual cancer (27 of 28 patients).

2 Hematopathology, 3 Pathology, 5 Background: Bortezomib (VELCADE � ) is a potent inhibitor of the 26S proteasome with broad antitumor activity. We performed a phase II study of bortezomib to evaluate its clinical effects in patients with metastatic breast cancer. Patients and methods: Twelve patients with metastatic breast cancer were treated with bortezomib (VELCADE � ) at a dosage of 1.5 mg/m 2 administered biweekly for 2 weeks with 1 week of rest in a 21-day cycle. The primary objective was clinical response rate. Toxicity and pharmacodynamics data were also obtained. Results: No objective responses were observed. One patient had stable disease, and 11 others experienced disease progression. The median survival time was 4.3 months (range, 0.9-37 months). The most common grade 3 or 4 toxicities included fatigue (58%; n= 7) and skin rash (33%; n= 4). The mean inhibition of specific chymotryptic activity was 53.1% (± 13.33%). A statistically significant reduction in the plasma interleukin-6 level was seen (P = 0.0354). Conclusion: Bortezomib was well tolerated but showed limited clinical activity against metastatic breast cancer when used as a single agent. The future development of this agent for the treatment of breast cancer should be guided

The purpose of the current study was to describe a population of young patients with breast carcinoma, their characteristics at the time of diagnosis, and the association of these characteristics with disease recurrence and survival.Four hundred fifty-two women ageor = 35 years with breast carcinoma were registered at The University of Texas M. D. Anderson Cancer Center (Houston, TX) between 1990 and 2002. The relation between clinicopathologic factors and disease recurrence-free survival (RFS) and overall survival (OS) was assessed. Cox regression analysis was used to identify independent survival predictors.The median age of the patients was 32 years. Most of the patients were white, and 20% were obese. Approximately 50% reported oral contraceptive use, 34% reported a family history of breast carcinoma, and 5% reported a family history of ovarian carcinoma. Sixty-nine percent of tumors were nuclear Grade 3 (using the modified Black's nuclear grading system), 52% had positive estrogen receptors, and 48% had positive progesterone receptors. HER-2/neu status was available in 60% of tumor specimens and 34% were HER-2/neu positive. The median follow-up was 36 months. There were 185 disease recurrences and 84 deaths. RFS was significantly shorter in patients who reported a family history of ovarian carcinoma (P0.0001) and in those who had hormone receptor-negative tumor specimens (P = 0.001). OS was significantly shorter in patients who reported a family history of ovarian carcinoma (P = 0.001), those who had hormone receptor-negative tumor specimens (P0.0001), or those withnuclear Grade 3 tumor specimens (P = 0.005).This young population with breast carcinoma was found to have more aggressive biologic features. Hormone receptor negativity and a family history of ovarian carcinoma were associated with shorter RFS and OS.

Purpose: We studied the safety and clinical activity of exisulind in combination with capecitabine in 35 patients with metastatic breast cancer (MBC). Patients and Methods: All patients had received previous anthracycline and taxane chemotherapies. Two dose levels of exisulind were explored, 125 and 250 mg orally bid as continuous daily therapy, concomitant with capecitabine 2,000 mg/m2 for 14 days in 21-day cycles. In the phase I study, the dose-limiting toxicities were hand-foot syndrome and diarrhea. The 125-mg bid dose was selected for phase II testing. Results: The most common nonhematologic grade 2 to 3 adverse events were hand-foot syndrome (57%) and fatigue (48%). The most frequent grade 2 to 3 laboratory abnormality was granulocytopenia. No death, unexpected adverse events, or cumulative toxicity were encountered. One complete and four partial responses were achieved (objective response rate, 16%) in the 31 patients assessable for response. The median duration of response was 31 weeks; three patients experienced stable disease longer than 26 weeks. Overall clinical benefit (complete response, partial response, or stable disease > 26 weeks) was 23%. Fourteen specimens were available for immunohistochemical assessment of phosphodiesterase-5 isoenzyme (PDE-5) and PDE-2 expression, which are the targets of exisulind. Eighty percent of tumors showed some expression of PDE-5 in the invasive cancer cells including 35% that showed moderate or strong staining. PDE-2 showed moderate or strong staining in 78% of tumors. There was no apparent association between tumor response and staining intensity. Conclusion: Exisulind (125 mg orally bid) in combination with capecitabine is well tolerated and the combination has anticancer activity similar to that of capecitabine alone in heavily pretreated patients with MBC.

Purpose: To select a daily dose of arzoxifene ( LY353381 ), a selective estrogen receptor modulator, for use in future studies in women with locally advanced or metastatic breast cancer who are either potentially tamoxifen sensitive (TS) or tamoxifen refractory (TR). Patients and Methods: This trial was a randomized, double-blind, phase II study of arzoxifene 20 mg (n = 55) and 50 mg (n = 57) in women with advanced or metastatic breast cancer. Patients were randomly assigned to balance for number of metastatic disease sites, prior tamoxifen therapy, and estrogen receptor status. The primary end point was tumor response rate (RR). Secondary end points included clinical benefit rate (CBR), time to progression (TTP), and toxicity. Results: Forty-nine patients were TS and 63 were TR. According to independent review, among TS patients, RR was higher in the 20-mg arm than the 50-mg arm (26.1% v 8.0%), with a longer TTP (8.3 v 3.2 months; P > .05). Among the TR patients, response rate was the same in the 20-mg and 50-mg arms (10.3%) with similar TTP (2.7 and 2.8 months, respectively; P > .05). CBR was higher in the 20-mg arm than in the 50-mg arm among TS patients (39.1% v 20.0%) and TR patients (13.8% v 10.3%). Arzoxifene was well tolerated. Dose-dependent toxicity was not demonstrated. There were no deaths during study. Conclusion: Arzoxifene is effective in the treatment of TS and TR patients with advanced or metastatic breast cancer at the 20-mg and 50-mg dose levels. Toxicities are minimal, and the therapy is tolerated. The 20-mg dose seems to be at least as effective as the 50-mg dose. Accordingly, arzoxifene 20 mg/d was selected for further study in patients with breast cancer.

Purpose To compare the frequency of canalicular stenosis as a side effect of weekly versus every-3-weeks docetaxel in patients with metastatic breast cancer. Design Retrospective nonrandomized comparative trial. Patients and methods Eighteen patients enrolled in a phase II study of weekly docetaxel plus trastuzumab and 18 patients enrolled in a phase II study of every-3-weeks docetaxel plus doxorubicin were evaluated. Each patient underwent a comprehensive ophthalmologic examination, probing and irrigation of the nasolacrimal duct, and, in some instances, a nuclear lacrimal scan. Main outcome measures If epiphora (excessive tearing) was reported by the patient, its time of onset was documented. In patients with epiphora, presence or absence of canalicular stenosis was evaluated on the basis of the findings on probing and irrigation. The duration of treatment with docetaxel, the dose frequency, and the cumulative dose of docetaxel were recorded in each case. Results Fourteen patients (77%) receiving weekly docetaxel plus trastuzumab had epiphora. Nine of these patients had significant anatomic narrowing of the canaliculi. Bicanalicular silicone intubation or dacryocystorhinostomy was recommended in all nine patients. Eight patients underwent surgery and experienced complete or near complete resolution of epiphora. Although two patients (11%) receiving every-3-weeks docetaxel plus doxorubicin reported transient symptoms of epiphora, neither patient was found to have narrowing of the canaliculi, and the epiphora was not severe enough to justify surgical intervention. The mean duration of docetaxel therapy for the patients in this study was 19 weeks. The mean cumulative dose of docetaxel was higher in patients with canalicular stenosis than in patients without this side effect. Conclusions Canalicular stenosis was more common in patients receiving weekly docetaxel than in those receiving every-3-weeks docetaxel for metastatic breast cancer. Bicanalicular silicone intubation early in the course of weekly docetaxel therapy should be considered, because this intervention can prevent complete closure of the canaliculi. Once complete or near complete stenosis of the canaliculi occurs, placement of a permanent Pyrex glass tube may become necessary to overcome the blockage of tear outflow.

PURPOSE The authors conducted a single-institution Phase I clinical trial to determine the maximum tolerated doses and to define the toxic effects of oral eniluracil and oral 5-fluorouracil (5-FU) combined with docetaxel in patients with metastatic breast carcinoma. PATIENTS AND METHODS. Patients with metastatic breast carcinoma were eligible if they had disease progression after anthracycline-based therapy and had never been exposed to taxanes. The starting doses of oral eniluracil and oral 5-FU were 11.5 mg/m2 and 1.15 mg/m2, respectively, twice daily on Days 1–14. Docetaxel was given intravenously at a starting dose of 50 mg/m2 on Day 1 only. The dose of docetaxel was escalated among cohorts until a maximum tolerated dose was reached. Courses were repeated every 21 days. RESULTS The authors treated 19 patients with Stage IV breast carcinoma, of whom 5 had received prior chemotherapy for their metastatic disease. Fifty-three percent had a performance status of 1, and 53% had bone or soft tissue involvement as the dominant site of disease. All patients had received prior therapy with doxorubicin. The dose-limiting toxicity was neutropenic fever. No episodes of sepsis were observed. Significant antitumor activity was observed with a total of two complete and nine partial responses. The recommended doses for Phase II studies are 72 mg/m2 docetaxel on Day 1 and 10.0/1.0 mg/m2 oral eniluracil/5-FU twice daily for a total of 14 days, with courses being repeated every 21 days. CONCLUSIONS The combination of oral eniluracil/5-FU and intravenous docetaxel is a safe and well tolerated regimen. Significant antitumor activity is associated with this combination. Cancer 2002;94:2321–6. © 2002 American Cancer Society. DOI 10.1002/cncr.10488

Purpose: We conducted a single-institution phase II clinical trial to determine the objective response rate, duration of response, time to progression, and overall survival in patients with anthracycline-resistant breast cancer treated with Doxil. Patients and methods: Patients with metastatic breast cancer were eligible if they had disease progression while receiving an anthracycline-containing regimen or developed evidence of metastatic disease during or within 6 months after the last cycle of an anthracycline-containing adjuvant regimen. Prior treatment with liposomal doxorubicin was not allowed. Patients received a dose of 50 mg/m2 infused every 4 weeks via a peripheral vein or central line. Doxil was administered for a total of six cycles or until disease progression. Results: We treated 11 patients with stage IV breast cancer of whom two had never received chemotherapy for their metastatic disease. Most had a performance status of 1 and had visceral involvement as their dominant site of disease. All patients had received prior therapy with doxorubicin. No clinical evidence of congestive heart failure or cardiac toxicity was observed. The most common toxicities were nonhematologic and were mostly grade 1/2. These included fatigue, nausea, vomiting, and stomatitis. Significant myelosuppression was only observed in one patient. No complete or partial response was observed. There were two patients who had a minimal response and two other patients who had evidence of stable disease. Conclusion: Doxil was well tolerated with minimal toxicity. However, the lack of antitumor activity in anthracycline-resistant breast cancer patients indicates that further evaluation in this patient population is not warranted.

PURPOSE: To evaluate the safety and efficacy of weekly docetaxel plus trastuzumab in women with HER-2–overexpressing metastatic breast cancer. Efficacy was correlated with serum HER-2 extracellular domain (ECD) levels. PATIENTS AND METHODS: Thirty women with metastatic breast cancer were treated with weekly docetaxel and trastuzumab as first- or second-line therapy. Both docetaxel 35 mg/m2/wk and trastuzumab 2 mg/kg/wk were delivered in 4-week cycles consisting of three weekly treatments followed by 1 week of rest. A loading dose of trastuzumab 4 mg/kg was administered 1 day before the start of the first cycle. RESULTS: The median delivered dose-intensity of docetaxel was 24 mg/m2/wk (range, 18 to 27 mg/m2/wk). The intent-to-treat overall response rate (ORR) was 63% (95% confidence interval [CI], 44% to 80%). The ORR in patients whose tumors were HER-2–positive by fluorescence in situ hybridization was 67% (16 of 24 patients; 95% CI, 45% to 84%). In patients with elevated serum HER-2 ECD at baseline, the ORR was 76% (95% CI, 53% to 92%), compared with 33% (95% CI, 7% to 70%) in patients with low HER-2 ECD levels (P = .04). Variations in HER-2 ECD concentrations during treatment correlated with response to treatment. Median time to progression was 9 months. Acute toxicity, including myelosuppression, was mild. Fatigue, fluid retention, and excessive tearing became more common with repetitive dosing. CONCLUSION: Weekly docetaxel and trastuzumab is an active combination for treating patients with HER-2–overexpressing metastatic breast cancer. Serum HER-2 ECD testing may be a promising method for monitoring patients on trastuzumab-based therapy.

Background: We developed SET4 as a targeted, droplet-based, next-generation RNA sequencing assay to measure both the SETER/PR index of gene expression and the percent of estrogen receptor (ER) transcripts with point mutation in the ligand-binding domain (LBD) in metastatic biopsies of Stage IV breast cancer. The SETER/PR index (31 genes) is a cumulative measure of gene expression for transcripts associated with ER and progesterone receptor (PR), excluding those with a direct role in proliferation. High SETER/PR could indicate increased sensitivity to endocrine therapy, whereas LBD mutations indicate resistance but might also induce high SETER/PR. Methods: Targeted needle biopsies from a metastatic site were prospectively obtained from 82 patients with HR+/HER2- breast cancer at time of any progression event, and preserved in RNAlater. Samples were prepared for targeted sequencing on a MiSeq by combining purified total RNA with SET4 primers and RT-PCR master mix into single molecule-formatted picodroplets using a RainDrop Source instrument, followed by thermal cycling and sample indexing. Calculated SETER/PR index and percent ER transcripts with LBD mutations were evaluated as continuous variables and compared to progression-free and overall survival using Cox regression analysis with log-rank test, if the next treatment after biopsy included endocrine therapy. Results: The average read depth for the LBD of the ER transcript was 33,475X (range: 1230-180,889X), confidently detecting mutation at 1% frequency. LBD mutations were identified in 17% (14/82) of metastases (range of mutated transcripts 1%-98%). LBD mutations (>10% of transcripts) were only observed in metastases with higher SETER/PR (above the median). In patients who next received endocrine therapy (n=58), higher SETER/PR predicted longer progression-free (PFS) (HR=0.37, p=0.0004, Δ median PFS 9 months) and overall survival (OS) (HR=0.49, p=0.03). The predictions were more pronounced in patients without LBD mutation (PFS HR=0.32, p=0.0001, Δ median PFS 13 months; OS HR=0.42, p=0.01). Currently, there are insufficient cases with LBD mutation for reliable survival analysis. Conclusion: The SET4 assay measured the percent of ER transcripts with activating LBD mutation (≥1% prevalence) and also downstream ER/PR-related transcription. High SETER/PR predicted longer PFS and OS with endocrine therapy. While activating LBD mutations may be associated with endocrine resistance of Stage IV cancer, they were associated with high SETER/PR index. Consequently, metastatic cancers with high SETER/PR index and no LBD mutation in ER transcripts were particularly sensitive to endocrine therapy. This single assay unraveled a possible interaction between genotype, phenotype, and treatment outcome; and is currently being evaluated in a larger cohort of patients. Citation Format: Rosanna Lau, Lily Fu, Michael Samuels, Rashmi K. Murthy, Bruno Sinn, Jane Yu, Rebekah Gould, Jennifer Litton, Alda Tam, Stacy Moulder, Daniel Booser, Debu Tripathy, Vicente Valero, Fraser Symmans. A targeted RNA-seq assay to measure activating ER mutations and ER/PR-associated gene expression predicts sensitivity to endocrine therapy for metastatic breast cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2017; 2017 Apr 1-5; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2017;77(13 Suppl):Abstract nr 1796. doi:10.1158/1538-7445.AM2017-1796

PURPOSE: We conducted this phase I trial to determine the safety and toxicity profile of LY353381.HCl—a novel, potent, third-generation selective estrogen receptor modulator (SERM)—because this benzothiophene derivative demonstrated an SERM profile in preclinical studies. PATIENTS AND METHODS: We studied 32 patients with recurrent or metastatic breast cancer. Patients were treated in four cohorts with oral daily doses of 10, 20, 50, and 100 mg. Pharmacokinetic sampling was performed during the first 72 hours following the first dose on day 1 and during the 24 hours after the day 57 dose. Eligibility criteria included Eastern Cooperative Oncology Group performance status of 0 to 2; no significant major organ dysfunction; and at least 3 weeks elapsed since most recent hormonal therapy, chemotherapy, and estrogen replacement therapy. RESULTS: The median patient age was 56 years (range, 30 years to 76 years). The median number of prior chemotherapies for metastatic disease was one (range, zero to four), while the median number of prior hormone regimens for metastatic disease was two (range, zero to five). Receptor status was estrogen receptor (ER) positive and progesterone receptor (PR) positive, 19 patients; ER positive and PR negative, eight patients; ER positive and PR unknown, two patients; and ER and PR unknown, three patients. Dose-limiting toxicity was not observed. Treatment was well tolerated with mild to moderate hot flashes in 18 of 32 patients (56%) at all dose levels. Transvaginal ultrasound performed at baseline and after 12 weeks of treatment showed no endometrial thickening. Of the 32 patients evaluable for response, six patients had stable disease for at least 6 months with a median duration of 7.7 months (range, 6.2 months to 33.8 months). The pharmacokinetics of LY353381.HCl were generally linear with respect to time and studied dose range. CONCLUSION: As predicted in preclinical testing, daily oral LY353381.HCl is safe, is well tolerated at all tested dose levels, and may be clinically beneficial in patients with extensively pretreated metastatic breast cancer. Further studies with LY353381 to evaluate the efficacy in patients with or without prior exposure to tamoxifen and fewer overall prior regimens are under way.

BACKGROUND Inflammatory breast carcinoma (IBC) is a rare but aggressive form of breast carcinoma. Anthracycline-based regimens represent the standard of treatment for IBC. Reports of significant clinical activity of paclitaxel in metastatic breast carcinoma led the authors to investigate the role of this drug in the management of IBC. METHODS Forty-four patients with IBC were enrolled between February 1994 and January 1998. The treatment plan consisted of induction chemotherapy (IC), mastectomy, adjuvant chemotherapy, and radiotherapy. Forty-two patients received IC with four cycles of fluorouracil, doxorubicin, and cyclophosphamide. If the clinical response was less than partial, patients were “crossed over” to paclitaxel before mastectomy. All patients received adjuvant paclitaxel. Patients unresectable after paclitaxel were offered high-dose chemotherapy with autologous peripheral blood progenitor cell support. RESULTS Thirty-four patients (81%) achieved an objective clinical remission; 3 patients (7%) achieved a clinical complete remission, 31 (74%) a partial remission. Six patients (14%) achieved pathologic complete remission. Sixteen patients were treated with paclitaxel, 7 of them (44%) were able to undergo mastectomy. Median time to progression (TTP) was 22 months. Median overall survival (OS) was 46 months. Concordance between clinical and pathologic response was documented in only 8 patients (24%). No differences in TTP and OS compared with a historical group of 178 IBC patients treated with anthracycline-based regimens. CONCLUSIONS Paclitaxel improves tumor resectability in anthracycline-refractory IBC. The impact of paclitaxel on the prognosis of IBC needs to be better evaluated in future trials using more dose-intensive schedules of administration. New imaging modalities may contribute to improve assessment of response to IC. Cancer 2001;92:1775–82. © 2001 American Cancer Society.

BACKGROUND The purpose of the current study was to evaluate the objective response rate and possibility of breast-conserving surgery using neoadjuvant tamoxifen in the multimodality treatment, including surgery and radiotherapy, of elderly or frail patients with locally advanced breast carcinoma. METHODS Forty-seven patients age > 75 years or age < 75 years with comorbid conditions and locally advanced breast carcinoma were treated with neoadjuvant tamoxifen (20 mg/day) for 3–6 months. This was followed by surgery and radiotherapy when feasible and adjuvant tamoxifen for 5 years or until disease recurrence. RESULTS The median age of the patients was 72 years (range, 48–86 years). Approximately 22% had T3 lesions, 57% had T4 lesions, 22% were Stage II (AJCC Manual for Staging Cancer, 3rd edition), and 78% were Stage III. Eighty percent were estrogen receptor positive. After 6 months of treatment with neoadjuvant tamoxifen, a response rate of 47% was observed, including a complete response rate of 6%. Twenty-nine patients (62%) were rendered free of disease by surgery, including 5 with breast-conserving procedures. After a median follow-up of 40 months, 23 patients (49%) remained disease free. The median survival time had not been reached at the time of last follow-up. No major toxicity was observed, with the exception of one patient who developed a possible tamoxifen-related Stage I endometrial carcinoma. The estimated 2-year and 5-year progression free and overall survival rates were 50% and 41%, and 83% and 59%, respectively. CONCLUSIONS The results of the current study show that neoadjuvant tamoxifen was effective in the treatment of elderly or frail patients with locally advanced breast carcinoma with estrogen receptor positive tumors, and resulted in a reasonable response rate, including complete responses and good overall survival. Cancer 2000;88:2054–60. © 2000 American Cancer Society.

The purpose of this study was to evaluate the maximum tolerated dose and the toxicity profile of vinorelbine administered by continuous infusion for 96 hours to patients who had received prior chemotherapy for metastatic breast cancer. Forty-three patients with metastatic breast cancer were treated with vinorelbine 8 mg intravenously for 10 minutes (day 1) followed by continuous infusion of vinorelbine for 96 hours. Treatments were repeated every 3 weeks. Eighty-eight percent of the patients had had two or more prior chemotherapeutic regimens: 91% had prior doxorubicin therapy and 77% had prior paclitaxel therapy. All 43 patients were evaluable for toxicity. The median age was 49 years. All patients had a performance status less than or equal to 2 and a life expectancy more than 12 weeks. Eight dose levels were evaluated, and a total of 182 cycles were given. National Cancer Institute grade III or IV granulocytopenia was observed in 64 (35%) cycles, neutropenic fever in 27 (15%) cycles, fatigue (National Cancer Institute grade III or IV) in 18 (10%) cycles, and hand-foot syndrome in 8 (4%) cycles. In 17 (9%) cycles, patients were hospitalized. The maximum tolerated dose of this regimen was determined to be vinorelbine 8 mg intravenously for 10 minutes (day 1) followed by continuous vinorelbine infusion 11 mg/m2 for 96 hours. The dose-limiting toxicity was neutropenic fever and stomatitis.

Background: Uncontrolled studies have reported encouraging outcomes for patients with high-risk primary breast cancer treated with high-dose chemotherapy and autologous hematopoietic stem cell support. We conducted a prospective randomized trial to compare standard-dose chemotherapy with the same therapy followed by high-dose chemotherapy. Patients and Methods: Patients with 10 or more positive axillary lymph nodes after primary breast surgery or patients with four or more positive lymph nodes after four cycles of primary (neoadjuvant) chemotherapy were eligible. All patients were to receive eight cycles of 5-fluorouracil, doxorubicin (Adriamycin), and cyclophosphamide (FAC). Patients were stratified by stage and randomly assigned to receive two cycles of high-dose cyclophosphamide, etoposide, and cisplatin with autologous hematopoietic stem cell support or no additional chemotherapy. Tamoxifen was planned for postmenopausal patients with estrogen receptor-positive tumors and chest wall radiotherapy was planned for all. All P values are from two-sided tests. Results: Seventy-eight patients (48 after primary surgery and 30 after primary chemotherapy) were registered. Thirty-nine patients were randomly assigned to FAC and 39 to FAC followed by high-dose chemotherapy. After a median follow-up of 6.5 years, there have been 41 relapses. In intention-to-treat analyses, estimated 3-year relapse-free survival rates were 62% and 48% for FAC and FAC/high-dose chemotherapy, respectively (P = .35), and 3-year survival rates were 77% and 58%, respectively (P = .23). Overall, there was greater and more frequent morbidity associated with high-dose chemotherapy than with FAC; there was one septic death associated with highdose chemotherapy. Conclusions: No relapse-free or overall survival advantage was associated with the use of high-dose chemotherapy, and morbidity was increased with its use. Thus, high-dose chemotherapy is not indicated outside a clinical trial. [J Natl Cancer Inst 2000;92:225‐33] Patients with stage III breast cancer or patients with stage II breast cancer and multiple positive axillary lymph nodes have an approximately 80% relapse rate at 5 years if treated only with locoregional therapy (1‐3). With optimal combined modality therapies, approximately 30% of the patients with stage IIIB breast cancer, 50% of those with stage IIIA breast cancer, and

BACKGROUND The authors conducted a single institution Phase II clinical trial to determine whether paclitaxel had antitumor activity in patients with metastatic breast carcinoma that was refractory to standard chemotherapy. METHODS Patients with metastatic breast carcinoma were eligible for the study if they had disease progression after at least 2 prior chemotherapy regimens. Patients who had received three prior regimens were treated in a separate cohort. All patients were required to have received doxorubicin in the past and were not eligible if they had received prior therapy with paclitaxel. The starting dose of paclitaxel for low risk patients was 175 mg/m2, administered as a 24-hour continuous infusion; the starting dose of paclitaxel was 150 mg/m2 for patients who had received ≥ 3 prior regimens. Therapy was given every 3 weeks and continued for at least 2 courses unless there was evidence of rapidly progressing disease, for at least 3 courses if there was no change in disease and Grade 3 or 4 (based on National Cancer Institute toxicity criteria) toxicity was not noted, and for 6 courses beyond the maximum response in patients who demonstrated complete or partial responses and showed no evidence of disease progression. RESULTS Sixty-eight of 69 patients entered in the study were evaluable for response: 35 patients who had received 2 prior chemotherapy regimens for Stage IV disease and 33 patients who had received ≥ 3 prior regimens. A partial response was observed in 7 patients who had received 2 prior regimens, for an objective response rate of 20% (95% confidence interval [95% CI], 14–26%). In the group who had received ≥ 3 prior regimens, a total of 6 partial responses were observed, for an objective response rate of 18% (95% CI, 12–23%). The median response duration was 8.2 months (range, 2.7–10.1 months) for the group who had received 2 prior regimens and 5.8 months (range, 2.1–9.5 months) for patients who received ≥ 3 prior regimens. Responses were noted in patients with anthracycline-resistant tumors. CONCLUSIONS Paclitaxel was active in heavily pretreated patients with metastatic breast carcinoma, including anthracycline-resistant breast carcinoma. Cancer 2000;89:2195–201. © 2000 American Cancer Society.

Background: Limited clinical data are available regarding the safety of docetaxel in metastatic breast cancer patients with liver dysfunction. Methods: Eligible patients had breast cancer with impaired liver function secondary to hepatic metastases and were candidates for docetaxel therapy. They were assigned to one of five groups on the basis of total bilirubin, alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase levels. All other causes of liver dysfunction were excluded, and bile duct obstruction was corrected, if possible, prior to study entry. Patients received docetaxel every three weeks. The chemotherapy dose was chosen on the basis of the patient’s level of hepatic dysfunction and escalated as tolerated. The primary outcome of this study was safety. The secondary outcomes were pharmacokinetic data and efficacy in terms of time to disease progression. Results: Twenty-three patients were enrolled. No unexpected toxicities occurred. Grade 3/4 fatigue (65%), neutropenia (30%), myalgias (26%), neutropenic fever (26%), vomiting (9%), and rash (9%) were the most common serious adverse events. The median time to progression was three months (range 1–18 months). Pharmacokinetic results indicated that patients with more severe hepatic dysfunction may have been underdosed based on our conservative dosing strategy. Conclusions: Docetaxel can be administered to patients with metastatic breast cancer and liver dysfunction after dose attenuation. However, because of a narrow therapeutic index in this clinical setting, therapy should be closely monitored with subsequent dose escalation when possible.

The aim of this study was to compare the time-to progression and overall survival (OS) in patients with metastatic breast cancer (MBC) with and without deleterious BRCA1/2 mutations. 195 women with MBC who were referred for BRCA genetic testing between 1997 and 2011 were included in the study. Logistic regression models and Cox proportional hazards models were fit to determine the associations between clinical variables and outcomes. Of 195 women with MBC, 21 % (n = 41) were positive for BRCA1/2 mutations. The number of metastatic sites at the time of metastatic disease was not different between BRCA1 versus BRCA2 carriers versus non-carriers (P = 0.77). The site of first metastasis was visceral-only in 70 % of BRCA1 carriers compared to 9 % in BRCA2 carriers and 37 % in non-carriers (P = 0.001). Median follow-up was 2.8 years. BRCA non-carriers and BRCA2 carriers had a longer time-to progression and OS compared to BRCA1 carriers (median time-to progression = 1.3 vs. 0.9 vs. 0.7 years; P = 0.31, and median OS = 4.88 vs. 4.94 vs. 1.34 years; P = 0.0065). In a multivariate model, no association was identified between BRCA positivity and time-to-event outcomes (P > 0.28). In addition, patients with triple-negative MBC carried a poorer prognosis irrespective of their BRCA status (P = 0.058 and P = 0.15 for the interaction term of BRCA status and triple-negative for time-to progression and OS, respectively). Our data indicate that BRCA1 carriers diagnosed with MBC have worse outcomes compared to BRCA2 carriers and non-carriers. However, the differences in outcome did not reach statistical significance likely due to small sample sizes.

PURPOSE To determine whether a schedule-dependent interaction occurs when paclitaxel and doxorubicin are administered sequentially. PATIENTS AND METHODS Ten patients with metastatic breast cancer received paclitaxel 125 mg/m2 over 24 hours either immediately before or after doxorubicin 48 mg/m2 over 48 hours as the initial chemotherapy treatment. Two such courses were given, and the sequence of administration was reversed after course 1. In cohort 1, paclitaxel preceded doxorubicin for course 1. In cohort 2, doxorubicin preceded paclitaxel for course 1. Doxorubicin levels were measured serially during the infusion and for 24 hours following it. Patients were assessed clinically for the occurrence of stomatitis and infection and granulocyte counts were measured twice weekly. RESULTS Eight patients had complete pharmacokinetic sampling for both courses. The mean end-of-infusion plasma doxorubicin concentrations (Cmax) were 70% higher in the paclitaxel-doxorubicin sequence compared with the reverse sequence (45 +/- 8 ng/mL v 26 +/- 5 ng/ mL). The mean doxorubicin clearance was 32% lower in the paclitaxel-doxorubicin sequence (34.3 +/- 10.3 L/h v 51.6 +/- 16.1 L/h, P < .01). Clinically, hematologic and mucosal toxic effects were worse in the paclitaxel-doxorubicin sequence. The median absolute granulocyte count was 0.2/microL in the paclitaxel-doxorubicin sequence and 1.3/microL in the doxorubicin-paclitaxel sequence. Seven of 10 patients who received the paclitaxel-doxorubicin sequence had grade 2 (n = 4) or 3 (n = 3) stomatitis, while only one of 10 patients who received the doxorubicin-paclitaxel sequence had grade 2 stomatitis and none had grade 3. CONCLUSION When paclitaxel by 24-hour infusion precedes doxorubicin by 48-hour infusion, doxorubicin clearance is reduced by nearly one third, which results in grade 2 and 3 stomatitis. To prevent this effect when paclitaxel (by 24-hour infusion) and doxorubicin are administered sequentially, doxorubicin should be given first. The mechanisms for this effect are under investigation.

Background: Metaplastic breast cancers (MpBCs) are a chemo-refractory group of tumors that contain a component of squamous and/or mesenchymal differentiation identifiable by light microscopy. MpBCs contain a high frequency of aberrations in the PI3K/AKT/mTOR pathway, making this pathway a potential target for therapy. Methods: Patients with advanced MpBC (N = 52) were treated with liposomal doxorubicin (D), bevacizumab (A) and the mTOR inhibitors temsirolimus (T) or everolimus (E). D and A were administered IV on day 1 with T (IV on days 1, 8 and 15) or E (continuous daily oral administration) using 21 day cycles. All tumors were evaluated to assess histology of metaplasia (spindle, mixed spindle vs non-spindle cell). Response was assessed every 6 weeks using RECIST. When available, archived tissue was evaluated for aberrations in the PI3K pathway using standard assays. Results: Fifty-two MpBC patients were treated with DAT (N = 39) or DAE (N = 13). Median age was 58 (range 37-79); median number of prior regimens for metastatic disease was 1 (range 0-5). The objective response rate (ORR) was 21% [complete response (CR) = 4 (8%); partial response (PR) = 7 (13%)] and 10 (19%) pts had stable disease (SD)≥6 months for a clinical benefit rate (CBR) of 40%. Tissue was available in 43 pts and 32 (74%) had a PI3K pathway activating aberrations. PI3K pathway aberration was associated with a significant improvement in ORR (31 vs 0%; P = 0.04) but not CBR (44 vs 45%; P = 1.00) or progression-free survival (median 5 vs 3 months; P = 0.35). The most frequent PI3K pathway aberration was mutation in PIK3CA, occurring in 19 patients. Outcomes were similar if mutations of PIK3CA were located in the helical or kinase domain (ORR 25% vs 27%; P = 1.00 and CBR 38% vs 47%; P = 1.00, respectively). Spindle cell was the most frequent metaplastic histology seen, occurring in 18 tumors and mixed with other metaplastic histologies including squamous, chondroid and osseous in 14 additional tumors, while 20 tumors had non-spindle cell morphologies. The incidence of PI3K pathway aberration was similar across histologies (61% in spindle vs 67% in mixed spindle vs 60% in non-spindle cell). Tumors with mixed histology had lower ORR, CBR and PFS, but this was not statistically significant, likely due to small numbers in each cohort: ORR 22% in spindle vs 7% in mixed spindle vs 30% in non-spindle cell, P = 0.27; CBR 50% in spindle vs 21% in mixed spindle vs 40% in non-spindle cell, P = 0.25; and PFS median 4 months in spindle vs 2 months in mixed spindle vs 5 months in non-spindle cell, P = 0.68. Conclusions: Response to mTOR inhibition is enhanced in MpBCs with PI3K pathway aberrations. However, specific aberrations in PIK3CA do not lead to differential response to mTOR inhibition. PI3K pathway aberrations and response to mTOR inhibition are seen across all histologies of MpBC, and the response is not enhanced in particular histologies. Citation Format: Reva K. Basho, Michael Gilcrease, Rashmi K. Murthy, Thorunn Helgason, Daniel J. Booser, Daniel D. Karp, Funda Meric-Bernstam, Kenneth R. Hess, Shelley M. Herbrich, Vicente Valero, Constance Albarracin, Jennifer Litton, Mariana Chavez-MacGregor, Nuhad K. Ibrahim, James L. Murray, Kimberly B. Koenig, David Hong, Vivek Subbiah, Razelle Kurzrock, Filip Janku, Stacy Moulder. Targeting the PI3K/AKT/mTOR pathway for the treatment of metaplastic breast cancer: Does location of PIK3CA mutation or histology affect response. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 2273.

609Background: Entinostat (E) an HDAC inhibitor, and Lapatinib (L) given in combination induces FOXO3a and mediates Bim1 expression in HER2+ cell lines resulting in apoptosis [Lee et al. BCRT 2014]...

Purpose We investigated whether capecitabine and docetaxel followed by fluorouracil, epirubicin, and cyclophosphamide (FEC) or weekly paclitaxel (WP) followed by FEC would improve relapse-free survival (RFS) in operable breast cancer. Patients and Methods In this single-institution study, patients with clinical stages I to IIIC breast cancer were randomly assigned on a 1:1 basis to WP 80 mg/m2 for 12 weeks followed by fluorouracil 500 mg/m2, epirubicin 100 mg/m2, and cyclophosphamide 500 mg/m2 (FEC-100) every 3 weeks for four cycles or docetaxel 75 mg/m2 on day 1 and capecitabine (XT) 1,500 mg/m2 on days 1 through 14 every 3 weeks for four cycles followed by FEC for four cycles and stratified by timing of chemotherapy (preoperative v adjuvant). Accrual was stopped short of 930 patients on the basis of a Bayesian predictive calculation that additional accrual would be unlikely to change the qualitative comparison of the two regimens. Results After enrollment of 601 patients and a median follow-up of 50 months, we observed no improvement in RFS between XT (87.5%; 95% CI, 82.7% to 91.1%) and WP (90.7%; 95% CI, 86.4% to 93.7%; P = .51). In the preoperative group, the pathologic complete response rate was 19.8% and 16.4% in the XT and WP arms, respectively (P = .45). Rates of breast-conserving surgery were similar between the two groups (P = .48). The XT arm had a significantly higher incidence of stomatitis (P < .001), hand-foot syndrome (P < .001), and neutropenic infection (P < .001). Conclusion There was no difference in efficacy between WP and XT as used in this randomized phase III trial. XT was associated with higher GI, skin, and neutropenic-related toxicities.

Purpose We examined borderline estrogen receptor (ER) –positive cancers, defined as having 1% to 10% positivity by immunohistochemistry (IHC), to determine whether they show the same global gene-expression pattern and high ESR1 mRNA expression as ER-positive cancers or if they are more similar to ER-negative cancers. Patients and Methods ER status was determined by IHC in 465 primary breast cancers and with the Affymetrix U133A gene chip. We compared expressions of ESR1 mRNA and a 106 probe set ER-associated gene signature score between ER-negative (n = 183), 1% to 9% (n = 25), 10% (n = 6), and more than 10% (n = 251) ER-positive cancers. We also assessed the molecular class by using the PAM50 classifier and plotted survival by ER status. Results Among the 1% to 9%, 10%, and more than 10% ER IHC–positive patients, 24%, 67%, and 92% were also positive by ESR1 mRNA expression. The average ESR1 expression was significantly higher in the ≥ 10% ER-positive cohorts compared with the 1% to 9% or ER-negative cohort. The average ER gene signature scores were similar for the ER-negative and 1% to 9% IHC-positive patients and were significantly lower than in ≥ 10% ER-positive patients. Among the 1% to 9% ER-positive patients, 8% were luminal B and 48% were basal-like; among the 10% ER-positive patients, 50% were luminal. The overall survival rate of 1% to 9% ER-positive patients with cancer was between those of patients in the ≥ 10% ER-positive and ER-negative groups. Conclusion A minority of the 1% to 9% IHC ER–positive tumors show molecular features similar to those of ER-positive, potentially endocrine-sensitive tumors, whereas most show ER-negative, basal-like molecular characteristics. The safest clinical approach may be to use both adjuvant endocrine therapy and chemotherapy in this rare subset of patients.

PURPOSE We studied the bioequivalence of a new once-daily regimen of tamoxifen citrate relative to the standard twice-daily regimen of tamoxifen citrate, an established antiestrogenic treatment for breast cancer. PATIENTS AND METHODS Of 30 women with breast cancer, 27 completed this open, two-period, crossover randomized trial. During one 3-month period, patients took one standard 10-mg tamoxifen tablet twice daily; during the preceding or following 3-month period, patients took one of the new 20-mg tablets once daily. Pharmacokinetic profiles and safety parameters were assessed at the end of each 3-month treatment period. RESULTS Overall, measured concentrations of tamoxifen and its principal active metabolite, N-desmethyltamoxifen, remained relatively constant over the 24-hour sampling periods at the end of each treatment sequence. For both compounds, the percentage differences of the geometric means for all pharmacokinetic parameters indicated bioequivalence of the once-daily regimen of tamoxifen relative to the standard twice-daily regimen. Both treatment sequences were well tolerated; reported adverse events occurred at similar frequencies with the two treatment regimens. CONCLUSION The 20-mg tamoxifen tablet taken once daily was bioequivalent to the 10-mg tamoxifen tablet taken twice daily, with no difference in relative risk. The once-daily treatment is a simpler regimen and may facilitate compliance, which may enhance therapeutic outcomes during long-term treatment of breast cancer.

Liposomal annamycin (L-AN) has shown antitumor activity in preclinical studies. It may selectively target tumors and bypass MDR-1 resistance. A total of 13 women with doxorubicin-resistant breast cancer were treated on this phase II study. The median number of prior chemotherapy regimens was two, and six patients had two or more organ sites of involvement. L-AN was administered at 190-250 mg/m(2) as an i.v. infusion over 1-2 h every 3 weeks. No responses were observed. Of the 13 patients, 12 had clear deterioration and new tumor growth after one or two courses. The 13th patient had prolonged grade 2 thrombocytopenia after one course, and was taken off study when the lung metastases increased 62 days after treatment. L-AN at this dose and on this schedule had no detectable antitumor activity in patients with doxorubicin-resistant metastatic breast cancer.

We hypothesized that distinct biological processes might be associated with prognosis and chemotherapy sensitivity in the different types of breast cancers.We performed gene set analyses with BRB-ArrayTools statistical software including 2331 functionally annotated gene sets (ie, lists of genes that correspond to a particular biological pathway or biochemical function) assembled from Ingenuity Pathway Analysis and Gene Ontology databases corresponding to almost all known biological processes. Gene set analysis was performed on gene expression data from three cohorts of 234, 170, and 175 patients with HER2-normal lymph node-negative breast cancer who received no systemic adjuvant therapy to identify gene sets associated prognosis and three additional cohorts of 198, 85, and 62 patients with HER2-normal stage I-III breast cancer who received preoperative chemotherapy to identify gene sets associated with pathological complete response to therapy. These analyses were performed separately for estrogen receptor (ER)-positive and ER-negative breast cancers. Interaction between gene sets and survival and treatment response by breast cancer subtype was assessed in individual datasets and also in pooled datasets. Statistical significance was estimated with permutation test. All statistical tests were two-sided.For ER-positive cancers, from 370 to 434 gene sets were associated with prognosis (P ≤ .05) and from 209 to 267 gene sets were associated with chemotherapy response in analysis by individual dataset. For ER-positive cancers, 131 gene sets were associated with prognosis and 69 were associated with pathological complete response (P ≤.001) in pooled analysis. Increased expression of cell cycle-related gene sets was associated with poor prognosis, and B-cell immunity-related gene sets were associated with good prognosis. For ER-negative cancers, from 175 to 288 gene sets were associated with prognosis and from 212 to 285 gene sets were associated with chemotherapy response. In pooled analyses of ER-negative cancers, 14 gene sets were associated with prognosis and 23 were associated with response. Gene sets involved in sphingolipid and glycolipid metabolism were associated with better prognosis and those involved in base excision repair, cell aging, and spindle microtubule regulation were associated with chemotherapy response.Different biological processes were associated with prognosis and chemotherapy response in ER-positive and ER-negative breast cancers.

A combination of uracil and ftorafur (UFT) was developed to combine the cytotoxic effects of 5-fluorouracil (5-FU) with convenient oral dosing. Leucovorin was combined with UFT to further potentiate the effect of 5-FU on tumor cells. Orally administered UFT and leucovorin provided higher peak plasma concentrations of 5-FU and prolonged therapeutic 5-FU concentrations compared with continuous infusion of 5-FU.Ninety-one patients with metastatic breast cancer who had been previously treated with anthracyclines and/or taxanes were treated with UFT and leucovorin, given orally, for the first 28 days of a 35-day cycle. The total daily dose of UFT was 300 mg/m(2), administered in 3 doses of 100 mg/m(2) each every 8 hours. The primary endpoint was time to disease progression (TTP). Secondary objectives included overall tumor response rate (overall response equals complete response plus partial response) and overall survival.Of the 91 patients enrolled, 70 were evaluable for efficacy. Although no complete responses were observed, 7 patients had partial responses, for an overall response rate of 10% in the evaluable population. The median TTP for the evaluable population was 10 weeks, and the proportion of patients who were free of disease progression at 6 months was 23%. The median overall survival was 59.4 weeks for all patients enrolled. Common, drug-relatedor = grade 3 adverse events (graded according to National Cancer Institute Common Toxicity Criteria, version 2) included diarrhea, vomiting, abdominal pain, and nausea.The combination of UFT and leucovorin administered orally in a 3-times-daily regimen was found to have modest activity. Grade 3 toxicities were manageable with appropriate dose adjustments in patients with metastatic breast cancer previously treated with anthracyclines and/or taxanes.

BACKGROUND: This study was performed to evaluate the outcomes of patients with locally advanced breast cancer (LABC) who were treated with a multidisciplinary approach including primary systemic chemotherapy and noncross-resistant adjuvant chemotherapy. METHODS: Patients with LABC received 4 or 6 cycles of doxorubicin and docetaxel (DT) as primary systemic chemotherapy (PST) every 21 days. Patients with adequate response underwent surgery followed by adjuvant chemotherapy according to pathologic response: complete (pCR), 2 more cycles of DT; partial (pPR), 2 more cycles of DT followed by 6 cycles of cyclophosphamide, methotrexate, and 5-fluorouracil (5-FU) (CMF); and minor (pMR), 6 cycles of CMF. Patients then received radiation and tamoxifen (hormone receptor-positive patients only). RESULTS: Eighty-eight patients were evaluable. Seventy-four patients had an adequate response to DT and were considered operable, and 72 underwent surgery. Ten patients (13.9%) achieved a pCR, 22 (30.5%) achieved a pPR, and 40 achieved a pMR (55.5%). Fourteen patients were considered nonoperable after DT and underwent salvage CMF therapy. Five of these patients underwent surgery and 1 had achieved a pCR. The estimated 5-year recurrence-free survival (RFS) rates for patients with pCR, pPR, and pMR were 80%, 77%, and 59%, respectively, and the estimated 5-year overall survival (OS) rates were 90%, 91%, and 74%, respectively. The 5-year OS rates were 82% for initially operable and 21% for initially inoperable patients (P ≤ .001) CONCLUSIONS: Multidisciplinary therapy that includes PST with DT and adjuvant therapy with CMF administered according to the clinical and pathologic response is associated with high long-term RFS and OS rates in patients with LABC. Clinical or pathologic PR or CR to DT predicts improved RFS and OS. Cancer 2010. Published 2010 by the American Cancer Society.