FOLFIRI plus bevacizumab (bev) as second-line therapy in patients (pts) with metastatic colorectal cancer (mCRC) who have failed first-line bev plus oxaliplatin-based therapy: The randomized phase III EAGLE study.

Abstract

3516 Background: The phase III ML18147 study (NCT00700102) showed a survival benefit for the continuation of bev after 1st-line bev-containing therapy in pts with mCRC. Continuation of bev beyond disease progression in this setting was approved by the FDA in Jan 2013. In the randomized, phase II SPIRITT study (NCT00418938) assessing 2nd-line treatment for mCRC, progression-free survival (PFS) was longer in the bev arm compared with the panitumumab arm, but the difference was not statistically significant. We describe the results of EAGLE, a multicenter, randomized phase III study evaluating the optimal dose of 2nd-line bev in Japan (UMIN000002557). Methods: Pts were randomized 1:1 to receive bev 5 mg/kg (Arm A) or 10 mg/kg (Arm B) plus FOLFIRI Q2W. Key eligibility criteria: age ≥20 years, mCRC, ECOG PS ≤1, and treatment failure to prior 1st-line bev plus oxaliplatin-based therapy (≥4 cycles). The primary endpoint was PFS. Secondary endpoints included time to treatment failure (TTF), PFS from 1st-line therapy, response rate (RR) and safety. The planned sample size was 370 pts to detect 30% risk reduction with 90% power assuming a two-sided significance level of 0.05. Results: 387 pts were randomized between Sep 2009 and Jan 2012; 367 pts formed the full analysis set (Arm A 179 pts; Arm B 188 pts). Baseline characteristics were well balanced between the treatment arms. Respectively for Arm A and B, PFS was 6.2 and 6.3 months (HR 1.03, 95% CI: 0.82-1.30; p=0.815), TTF 5.3 and 5.3 months (HR 1.08, 95% CI: 0.87-1.33; p=0.485), PFS from 1st-line therapy 17.6 and 17.8 months (HR 0.99, 95% CI: 0.78-1.25; p=0.919) and RR 11.7% and 10.1%. Frequently reported AEs in Arm A and B, respectively, were: hypertension (13.0%, 18.1%), proteinurea (36.8%, 35.2%), GI perforation (4.7%, 3.1%), grade 3/4 neutropenia (46.1%, 39.9%), grade 3/4 fatigue (7.8%, 10.9%), and grade 3/4 anorexia (5.7%, 5.2%). Treatment-related deaths occurred in 2 pts in each arm. Conclusions: The study did not meet its primary endpoint. PFS in Arm A was comparable to that reported in the ML18147 study. Safety in both arms was consistent with previously reported studies. Clinical trial information: UMIN000002557.