Nivolumab versus the standard of care for cancer therapy: A meta-analysis of 6 CHECKMATE trials comparing overall survival.
e15165 Background: Nivolumab (N) is an antineoplastic agent approved for multiple different tumor origins as well as tumor agnostic based on MSI status. Thus, understanding the tumor characteristics most predictive of response is essential. Living meta-analysis provides a method to continuously assimilate emerging trials. In this study, we created a living meta-analysis to compare the effect of N on overall survival (OS). Methods: Meta-analysis was conducted according to the PRISMA guidelines. PubMed and Cochrane databases, and conference abstracts (e.g. ASCO, ESMO), were searched for phase III CHECKMATE RCT’s that reported OS among cancer patients receiving N. Results: Six phase III trials involving 3,342 patients (1,826 in N arms) treated for 4 different types of cancer were retrieved. Median follow up was 12.1 months [range: 5.1-25.2]. Improved efficacy and safety were observed in all N arms compared to control groups (22.8% ORR; 17.4% grade 3-5 AE vs 15.1% ORR; 51% grade 4-5 AE). Treatment was N alone, SOC chemo, and N + chemo in four (33%), six (50%), and two (16%) arms, respectively. Primary endpoints were OS in the first-line setting in 50% of all arms. Excluding one RCT due to insufficient survival data, the mean median OS was 11.1 [95% CI: 7.5-14.4] vs 8.7 [95% CI: 5.1-13.2] months in the total populations for all N and control arms, respectively. N improved OS when used in any cancer type, setting, or therapy for advanced refractory or chemo-naive cancer patients. Also, efficacy of N was improved with PD-L1% (Table). Conclusions: Among all trials, N was associated with improved OS. Additional meta-analysis is ongoing with R software (version 3.3.3; R Fdn.). Random-effects models will be used to compare OS. Heterogeneity will be assessed with Cochrane Q-statistic and quantified with I2test via subgroup analyses for cancer type, setting, therapy, and PD-L1%. [Table: see text]