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Phase II trial of pemetrexed plus bevacizumab for second-line therapy of patients with advanced non-small-cell lung cancer: CCTGcctg and SWOG study N0426
Journal of Clinical Oncology, 10/26/09
Adjei AA et al. – The purpose of this study was to evaluate the efficacy and toxicity of pemetrexed combined with bevacizumab as second-line therapy for patients with advanced non–small-cell lung cancer (NSCLC) and to correlate allelic variants in pemetrexed-metabolizing genes with clinical outcome. The study did not meet it's primary end point. However, the median PFS time of 4 months is promising. Pharmacogenetic studies in larger cohorts are needed to definitively identify polymorphisms that predict for survival and toxicity of pemetrexed.
Methods- Patients with previously treated NSCLC received pemetrexed (500 mg/m2 intravenous) combined with bevacizumab (15 mg/kg intravenous) every 3 weeks
- Primary end point, evaluated using one-stage Fleming design for detecting true success rate of at least 70%, was the proportion of patients who were progression free and on treatment at 3 months
- Polymorphisms in genes responsible for pemetrexed transport (reduced folate carrier [SLC19A1]) and metabolism (folylpolyglutamate synthase [FPGS] and gamma-glutamyl hydrolase [GGH]) evaluated in germline DNA (blood) correlated with treatment outcome
- 48 evaluable patients (14 females and 34 males) received a median of 4 cycles (range, one to 20 cycles)
- Most common grade 3 or 4 nonhematologic adverse events (AEs) were fatigue (13%), dyspnea (10%), and thrombosis (10%)
- Grade 3 or 4 hematologic AEs were neutropenia (19%) and lymphopenia (13%)
- 24 of the first 42 patients met success criteria
- Median overall survival (OS) and progression-free survival (PFS) times 8.6 and 4.0 months, respectively
- Exon 6 (2522)CT polymorphism in SLC19A1 correlated with 3-month progression-free status and with PFS
- IVS1(1307)CT polymorphism in GGH correlated with OS
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