Phase II Study of Bevacizumab, Capecitabine, and Oxaliplatin Followed by Bevacizumab Plus Erlotinib as First-Line Therapy in Metastatic Colorectal Cancer

摘要

This phase II trial investigated the efficacy of an induction regimen of bevacizumab, capecitabine plus oxaliplatin (XELOX) followed by maintenance therapy with bevacizumab plus erlotinib as first-line therapy in patients with metastatic colorectal cancer. Patients with metastatic colorectal cancer received intravenous bevacizumab 7.5 mg/kg plus oxaliplatin 130 mg/m2 on day 1 followed by oral capecitabine 1,000 mg/m2 twice daily on days 1-14 every 3 weeks for six cycles. In the absence of disease progression, patients then received bevacizumab 7.5 mg/kg every 3 weeks plus oral erlotinib 150 mg once daily. The primary study endpoint was progression-free survival. In the intention-to-treat population (n=90), the median progression-free survival was 9.2 [95% confidence interval (CI): 7.9-11.9] months, and the median overall survival was 25.8 (95% CI: 18.0-30.9) months. In the patient subpopulation who received both induction and maintenance therapy (n=52), median progression-free survival was 11.1 (95% CI: 9.0-15.7) months, and the median overall survival was 29.5 (95% CI: 23.7-36.7) months. KRAS status did not predict efficacy. The most common grade 3/4 adverse events were diarrhea, asthenia, and neutropenia. XELOX-bevacizumab for 6 cycles followed by bevacizumab-erlotinib maintenance therapy has been shown to be a highly active and well-tolerated first-line regimen in patients with metastatic colorectal cancer.