P1.15-33 Real-World Data on Prognostic Factors for Overall Survival in NSCLC Patients Treated with Bevacizumab Combination Therapy

Abstract

Bevacizumab is used as combination with chemotherapy as 1st-line treatment for non-squamous cell carcinoma. In order to understand the influence of bevacizumab on different combination medication response, this study aimed to identify independent prognostic factors for overall survival (OS) of NSCLC patients receiving bevacizumab treatment in real-world practice. We performed retrospective collected non-squamous cell carcinoma patients undergoing bevacizumab treatment and analyzed their response and overall survival to bevacizumab. Demographic data, TTF-1 stain status, EGFR mutation status, and survival data were collected. Survival data analysis were plotted by the Kaplan–Meier method and compared by the log-rank test. From November 2009 to October 2015, 114 non-squamous cell carcinoma patients treated with bevacizumab were enrolled for analysis. The median overall survival was 21.9 months. There were 11 patients who received continuous bevacizumab beyond disease progress of 1st-line treatment and in all treatment courses. They had longer overall survival than those (N = 103) who did not received bevacizumab in all treatment courses (p = 0.003). The patients harboring positive TTF-1 tumor also had a longer overall survival than those harboring negative TTF-1 tumors (p = 0.025). Multivariate analysis revealed that patients harboring tumor with positive staining of TTF-1 (p < 0.001) and those received bevacizumab in all treatment course (p = 0.013) had a longer median OS. Non-squamous cell carcinoma patients receiving bevacizumab beyond 1st-line treatment failure, as all treatment course, had a longer median OS than those received bevacizumab in partial course.