Activity and safety of CPBev regimen (cisplatinum, pemetrexed, and bevacizumab) as first-line therapy for locally advanced or metastatic adenocarcinoma of the lung: Final results of a phase II study.

Abstract

e18026 Background: During the past five years the paradigms of advanced lung cancer therapy dramatically changed; Bevacizumab and Pemetrexed, when administered separately in association with platinum salts, demonstrated to improve survival in patients with non-squamous histologies. In the aim to investigate activity and safety of a three-drugs-regimen containing both these agents and cis-platinum, we conducted a multi-institutional phase II study started on november 2007. Methods: chemonaive patients with non-squamous non-small cell lung cancer were considered eligible We adopt the two-stage of Simon model as statistical design of the study; activity of the regime, expressed as overall response rate and safety were the main end-points. Administered doses were 75 and 500 mg/p.s.m for cis-platinum and pemetrexed respectively and 7.5 mg./kg for Bevacizumab, for 3 - 6 cycles. G-CSF were administered only after the first cycle of therapy, whereas vitamin supplementation started from day 1 of the first cycle. No maintenance therapy was allowed. Results: We registered 9 partial responses among the first 15 patients treated so, accordingly with the design of the study, we completed the enrollment up to 32 patients. Patients characteristics are: male/female: 20/12, median age (years): 59 (r. 36 - 77), ECOG-WHO/PS 0/1: 21/11. One hundred eighty-three cycles of CPBev were administered: we registered only 13 cases of grade 3 adverse events. No grade 4 toxicities were observed. One case of allergic reaction to cis-platinum were observed. In terms of response rate, we registered 20/32 (62.5%) partial responses, 8/32 (25%) stable diseases and 4/32 (12.5%) progressive diseases, with a clinical benefit rate of 28/32 (87.5%). Results in terms of outcome parameters expressed by progression-free and overall survival will be presented at the meeting. Conclusions: On the basis of our data, CPBev have a good toxicity profile and seems to be extremely active in advanced non-squamous lung carcinomas.