Search

6086 Background: Salivary gland cancers comprise

9073 Background: Treatments targeting critical molecular alterations (EGFR, ALK, and ROS1) in NSCLC are highly effective. MyPathway (NCT02091141) is an ongoing, phase 2, multi-basket study evaluating the efficacy of targeted treatment in non-indicated tumor types harboring alterations in the HER2, BRAF, Hedgehog (Hh), or EGFR pathways. Interim results in NSCLC are presented. Methods: Patients with previously treated advanced NSCLC and alterations in the HER2 (amplification and/or mutation), BRAF (V600E or other mutations), Hh (SMO or PTCH-1 mutations), or EGFR (mutations other than known activating mutations) pathways received standard doses of pertuzumab + trastuzumab, vemurafenib, vismodegib, or erlotinib, respectively, until disease progression or unacceptable toxicity. The HER2, BRAF, and Hh cohorts are included in this analysis. The primary endpoint is investigator-assessed objective response rate (ORR, defined as complete response [CR] + partial response [PR]) by RECIST v1.1. Results: As of November 30, 2016, 61 patients with NSCLC and HER2 (n = 36), BRAF (n = 22), or Hh (n = 3) alterations have been treated (median age of 64 years, 49% male, 85% adenocarcinoma, and a median of 2 previous regimens). Median treatment duration was 1.8 (range, 0–21.4) months. Efficacy in the 55 patients with the minimum required follow-up for efficacy analysis is summarized in the table. Conclusions: Targeted therapy is active in patients with previously treated NSCLC harboring BRAF V600E mutations or HER2 alterations (amplifications and/or mutations). These cohorts have been expanded as MyPathway accrual continues. Additional efficacy data and details regarding molecular alterations will be presented. Clinical trial information: NCT02091141. [Table: see text]

348 Background: Patients (pts) with mUC have few treatment options beyond the second-line setting. HER2 gene amplification has been reported in a minority of pts with UC, but there have been anecdotal reports of the activity of HER2-targeted agents. MyPathway is a multi-basket study evaluating the efficacy and safety of targeted therapies in non-indicated tumor types harboring relevant molecular alterations. We present preliminary data for pts with HER2-positive mUC receiving HER2-targeted treatment with pertuzumab + trastuzumab. Methods: MyPathway (NCT02091141) is an open-label, multicenter, phase IIA study. Pts in this subset analysis had refractory mUC with HER2 amplification or putative activating mutations by gene sequencing, FISH, or IHC. Pts received standard doses of pertuzumab + trastuzumab without chemotherapy until disease progression or unacceptable toxicity. The primary endpoint is investigator-assessed overall response rate (RECIST v1.1). Results: As of July 31, 2016, 12 pts with platinum-resistant HER2-positive mUC (HER2-amplified, n=9; HER2-mutated, n=3) have been enrolled. At a median follow-up of 5.4 (range 0.9–14.5) mos, 1 pt had complete response (CR, ongoing at 12.5 mos), 2 had partial responses (PR; duration of response, 3.7 and 5.5 mos), and 2 had stable disease (SD) for >4 mos (Table). Safety was consistent with the product labels. Conclusions: Preliminary results indicate that the combination of pertuzumab + trastuzumab has activity in previously treated HER2-amplified mUC, including a durable CR in a pt with peritoneal metastases. Accrual to MyPathway is ongoing. Clinical trial information: NCT02091141. [Table: see text]

402 Background: Biliary cancers have a high mortality rate, with limited treatment options. While HER2 is overexpressed in 9-20% of biliary cancers, it has not been fully explored as a therapeutic target. MyPathway is a multi-basket study evaluating the efficacy and safety of targeted therapies in non-indicated tumor types harboring relevant genetic alterations. We present preliminary data for patients with HER2-positive metastatic biliary cancer receiving HER2-targeted treatment with pertuzumab + trastuzumab. Methods: MyPathway (NCT02091141) is an open-label, multicenter, phase IIA study. Patients in this subset analysis had refractory metastatic biliary cancer with HER2 amplification/overexpression or putative activating mutations by gene sequencing, FISH, or IHC. Patients received standard doses of pertuzumab + trastuzumab until disease progression or unacceptable toxicity. The primary endpoint is investigator-assessed overall response rate (RECIST v1.1). Results: As of July 31, 2016, 11 patients with HER2-positive biliary cancer (HER2-amplified/overexpressed, n = 8; HER2-mutated, n = 3 [D277Y, S310F, and A775-G776insYVMA]) have been enrolled. At a median follow-up of 4.2 (range 2.0–12.0) months, 4 patients had partial responses (PR) and 3 had stable disease (SD) for > 4 months (Table). Safety was consistent with the package inserts. Conclusions: Preliminary results indicate that pertuzumab + trastuzumab has activity in HER2 amplified/overexpressed/mutated metastatic biliary tumors, suggesting HER2 as a therapeutic target for these rare cancers. Accrual to MyPathway is ongoing. Clinical trial information: NCT02091141. [Table: see text]

676 Background: Among recent advances in precision medicine, HER2 has emerged as a potential therapeutic target for advanced colon cancer. MyPathway is a multi-basket study evaluating the efficacy and safety of targeted therapies in non-indicated tumor types harboring relevant genetic alterations. We present updated data for an expanded cohort of patients with HER2-amplified/overexpressed mCRC receiving HER2-targeted therapy with pertuzumab + trastuzumab. Methods: MyPathway (NCT02091141) is a multicenter, open-label, phase IIA study. Patients in this analysis had treatment-refractory HER2-amplified/overexpressed mCRC by gene sequencing, FISH, or IHC. Patients received standard doses of pertuzumab + trastuzumab until disease progression or unacceptable toxicity. The primary endpoint is investigator-assessed overall response rate. The cutoff date was July 31, 2016. Results: Of 34 patients with mCRC enrolled, 32 have had ≥1 tumor assessment. At a median follow-up of 5.2 (range 0.7–18.3) months from treatment initiation, 12 patients had partial responses (PR), with stable disease (SD) for >4 months in 3 additional patients (Table). The safety profiles were consistent with the product labels. Conclusions: Interim data show that HER2-targeted therapy with pertuzumab + trastuzumab, a chemotherapy-free regimen, is active in heavily pretreated HER2-amplified/overexpressed mCRC. The ORR was 37.5%, responses were durable (median 11.1 months), and the CBR was 46.9%. Accrual to MyPathway is ongoing. Clinical trial information: NCT02091141. [Table: see text]

LBA11511 Background: The MyPathway study (NCT02091141) evaluates agents targeting the HER2, BRAF, Hedgehog (Hh), or EGFR pathways in non-indicated tumors with relevant genetic abnormalities. Early results from MyPathway merit pre-planned tumor-cohort expansion. Methods: Eligible pts had advanced solid tumors with no curative therapy and molecular alterations in HER2, BRAF, Hh, or EGFR. Pts received standard doses of trastuzumab + pertuzumab (for the HER2 pathway), vemurafenib (BRAF), vismodegib (Hh), or erlotinib (EGFR) based on alteration. The primary endpoint is investigator-evaluated response rate within a tumor-pathway cohort (RECIST 1.1). Cohort size and expansion is determined by Simon’s two-stage design criteria. Results: By December 14, 2015, MyPathway included 129 pts with available baseline assessments and alterations in HER2 (n = 82; 53 amplifications, 23 mutations, 5 both, 1 RBMS-NRG1 fusion), BRAF (n = 33; 18 V600E, 15 other), Hh (n = 8; 7 PTCH1, 1 SMO), or EGFR (n = 6). Pts had a median of 3 (range, 0–10) prior lines of therapy. Best responses (n = 118) are shown below; 11 pts had insufficient follow-up for reevaluation and were not analyzed. 22 pts had PR/CR (1 CR); current response durations were up to 11 months. Conclusions: Targeted therapy produced responses in pts with 9 different tumor types outside of current drug indications. As enrollment increases for all tumor-pathway cohorts, analyses of tumor responses based on specific alterations (eg, HER2 amplifications vs. mutations) are planned. The HER2 amplified colorectal, bladder, and biliary, and the BRAF lung cohorts will be expanded based on observed activity. Clinical trial information: NCT02091141. [Table: see text]

TPS11111 Background: While many targeted agents are approved for specific cancers, molecular profiling has increasingly led to the identification of genetic abnormalities in tumor types for which t...