Impact of Anti-angiogenic Agents on Chemotherapy Efficacy in Patients With Metastatic Colorectal Cancer: Second-line FOLFIRI Plus Bevacizumab or Aflibercept

Background/Aim: We compared the efficacy and safety of second-line FOLFIRI with bevacizumab (Bmab) or aflibercept (AFL) in patients with unresectable metastatic colorectal cancer (mCRC) to clarify selection criteria for anti-angiogenic agents. Patients and Methods: The subjects were patients with mCRC who received second-line FOLFIRI in combination with Bmab or AFL. The primary endpoint was median overall survival (OS). Secondary endpoints were median time to treatment failure (77'F), overall response rate (ORR) and incidence of adverse events. Results: Data from 26 patients in the Bmab group and 19 in the AFL group were analyzed. Median OS was slightly longer in the AFL group compared to the Bmab group, whereas median TTF was similar. ORR tended to be higher in the AFL group. The incidence of >= grade 2 diarrhea and proteinuria was significantly higher in the AFL group than the Bmab group. Conclusion: In patients given combination treatment with FOLFIRI for second-line treatment of mCRC, AFL can increase response rates compared to Bmab, which may contribute to longer survival.