Summary
Background To investigate the efficacy and safety of bevacizumab beyond first progression combined with doublet chemotherapy in patients with metastatic colorectal cancer. Methods This multicenter phase II study included 76 patients with metastatic colorectal cancer progressed after first-line bevacizumab plus doublet chemotherapy. Study treatment consisted of second-line continuation of bevacizumab plus crossover standard doublet chemotherapy, consisting of FOLFOX, CapeOX, or FOLFIRI. Bevacizumab was administered in doses of 5 mg/kg/2-week or 7.5 mg/kg/3-week according to the schedules of the combined regimen. Results Median progression-free survival (PFS) and overall survival (OS) was 6.5 months (95 % CI, 5.2–7.8) and 12.8 months (95 % CI, 8.8–16.9), respectively, with no significant differences according to combined doublet chemotherapy. The response rate (RR) was 17.1 % (95 % CI, 8.6–5.6) with no statistical significance between regimens (p = 0.053). The first-line RR and PFS did not affect the second-line efficacy outcomes; RR (14.0 % vs 21.2 %, p = 0.405), median PFS (5.6 vs 6.7 months, p = 0.335), and OS (15.4 vs 11.0 months, p = 0.383) were not different between previous responders and non-responders, and the median PFS (p = 0.186) and OS (p = 0.495) were not different either according to the length of first-line PFS; however, OS from the first-line chemotherapy was longer in patients with longer first-line PFS (26.4 vs 14.8 months, p = 0.010). Bevacizumab-related significant adverse events included proteinuria (1.3 %) and thromboembolism (1.3 %). Conclusions Bevacizumab beyond first progression could be considered a treatment strategy even in patients progressed after first-line bevacizumab plus doublet chemotherapy. Second-line efficacy outcomes did not differ according to the first-line responses.
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Acknowledgments
This study was supported by a grant of the Korea Healthcare Technology R&D Project, Ministry of Health and Welfare, Republic of Korea (A102065 and A062254). Bevacizumab was kindly provided by Roche Korea Co., Ltd.
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Yong Sang Hong and Jeeyun Lee equally contributed to this work.
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Hong, Y.S., Lee, J., Kim, Kp. et al. Multicenter phase II study of second-line bevacizumab plus doublet combination chemotherapy in patients with metastatic colorectal cancer progressed after upfront bevacizumab plus doublet combination chemotherapy. Invest New Drugs 31, 183–191 (2013). https://doi.org/10.1007/s10637-012-9853-3
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DOI: https://doi.org/10.1007/s10637-012-9853-3