1. Metastatic breast cancer patients treated with low-dose metronomic chemotherapy with cyclophosphamide and celecoxib: clinical outcomes and biomarkers of response.
- Author
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Perroud, Herman, Alasino, Carlos, Rico, Maria, Mainetti, Leandro, Queralt, Francisco, Pezzotto, Stella, Rozados, Viviana, Graciela Scharovsky, O., Perroud, Herman Andres, Alasino, Carlos Maria, Rico, Maria Jose, Mainetti, Leandro Ernesto, Pezzotto, Stella Maris, Rozados, Viviana Rosa, and Scharovsky, O Graciela
- Subjects
METASTATIC breast cancer ,CANCER patients ,CANCER chemotherapy ,CYCLOPHOSPHAMIDE ,CELECOXIB ,THERAPEUTIC use of biochemical markers ,MEDICAL sciences ,TOXICITY testing ,THERAPEUTICS ,ANTINEOPLASTIC agents ,BREAST tumors ,DRUG therapy ,CLINICAL trials ,COMPARATIVE studies ,DRUG monitoring ,DRUG administration ,RESEARCH methodology ,MEDICAL cooperation ,METASTASIS ,RESEARCH ,TUMOR classification ,EVALUATION research ,TREATMENT effectiveness ,DISEASE progression - Abstract
Background: Preclinical results showing therapeutic effect and low toxicity of metronomic chemotherapy with cyclophosphamide (Cy) + celecoxib (Cel) for mammary tumors encouraged its translation to the clinic for treating advanced breast cancer patients (ABCP).Patients and Methods: A single-arm, mono-institutional, non-randomized, phase II, two-step clinical trial (approved by Bioethics Committee and Argentine Regulatory Authority) was designed. Patients received Cy (50 mg po.d) + Cel (200 mg p.o.bid). Patient eligibility criteria included: ABCP who progressed to anthracyclines, taxanes and capecitabine, ≤4 chemotherapy schemes, with good performance status. Several pro- and anti-angiogenic molecules and cells were determined as biomarkers. Informed consent was signed by all patients. Primary endpoint was clinical benefit (CB).Results: Twenty patients were enrolled. Main clinical outcomes were prolonged disease stabilization and partial remission in 10/20 and 1/20 patients, respectively. CB was 55 %, and time to progression (TTP) was 21.1 weeks. Median TTP in patients who achieved CB was 35.6 weeks, and mean overall survival was 44.20 weeks. There were no grade 3/4 toxicities associated with treatment. Circulating endothelial cells (CECs) increased at the time of progression in patients who showed CB (P = 0.014). Baseline CECs and circulating endothelial progenitor cells showed marginal associations with TTP. Serum VEGF decreased (P = 0.050), sVEGFR-2 increased (P = 0.005) and VEGF/sVEGFR-2 ratio decreased during treatment (P = 0.041); baseline VEGF and VEGF/sVEGFR-2 were associated with TTP (P = 0.035 and P = 0.030, respectively), while sVEGFR-2 did not.Conclusions: Treatment was effective, showing low toxicity profile and excellent tolerability. The combination had anti-angiogenic effect. Increased levels of CEC could be useful for detecting progression. Baseline VEGF and VEGF/sVEGFR-2 values could be useful as early predictors of response.Trial Registration: ANMAT#4596/09. [ABSTRACT FROM AUTHOR]- Published
- 2016
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