Safety and efficacy of irinotecan plus high-dose leucovorin and intravenous bolus 5-fluorouracil for metastatic colorectal cancer: pooled analysis of two consecutive southern Italy cooperative oncology group trials.

Abstract Background A biweekly regimen of irinotecan 200 mg/m2 on day 1 and levo-leucovorin (LV) 250 mg/m2 plus 5-fluorouracil (5-FU) 850 mg/m2 via intravenous bolus on day 2 was assessed in 2 consecutive randomized trials in metastatic colorectal cancer (CRC). Patients and Methods Individual data of 254 patients were merged, and baseline features potentially affecting overall response rate (ORR), progression-free survival (PFS),overall survival (OS), and occurrence of severe toxicity were analyzed by univariate and multivariate analyses. Results In the pooled series, ORR was 33% (95% confidence interval [CI], 27%-39%). Liver-only disease (47% vs. 25%; P = 0.0012) and absence of previous we…