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ABSTRACT Introduction Avelumab, an anti‐programmed death ligand 1 antibody, was approved in combination with axitinib for curatively unresectable or metastatic renal cell carcinoma (RCC) in Japan in December 2019. Because the pivotal JAVELIN Renal 101 study included a limited number of Japanese patients, post‐marketing surveillance (PMS) was required to evaluate outcomes (safety and effectiveness) in patients with RCC who received avelumab + axitinib treatment in clinical practice in Japan. Materials and Methods We report data from prospective, noncomparative, multicenter, observational PMS in patients with RCC who received ≥ 1 dose of avelumab. Patients were enrolled between December 2019 (date of regulatory approval) and May 2021. The primary objective was to evaluate safety, defined as adverse drug reactions (ADRs) of safety specifications occurring during an observation period of ≤ 52 weeks for each patient. The secondary objective was to evaluate effectiveness, including best overall response and overall survival (OS). Results In total, 328 patients were included in the safety and effectiveness analysis sets. Overall, 173 patients (52.7%) had ADRs of safety specifications of any grade, most commonly thyroid dysfunction (n = 69 [21.0%]), infusion reaction (n = 65 [19.8%]), and hepatic disorders (n = 45 [13.7%]). Objective responses occurred in 118 patients (36.0%), including complete or partial responses in 13 (4.0%) and 105 (32.0%), respectively; the disease control rate was 75.6%. The 12‐month OS rate was 83.7% (95% CI, 78.9%–87.4%). Discussion This PMS confirmed the safety, tolerability, and effectiveness of avelumab + axitinib in patients with RCC in clinical practice in Japan, with a benefit–risk profile comparable to that observed in clinical trials.

Abstract Introduction Avelumab + axitinib was approved in Japan in December 2019 for the treatment of curatively unresectable or metastatic renal cell carcinoma (RCC) based on results from the JAVELIN Renal 101 trial. Materials and Methods To evaluate the safety and effectiveness of avelumab + axitinib in older patients in general clinical practice in Japan, an ad hoc analysis of data from post‐marketing surveillance (PMS) by age group was conducted. Results The analysis population included 328 patients who had received ≥1 dose of avelumab and were enrolled between December 2019 and May 2021. In total, 100 patients (30.5%) were aged ≤64 years, 130 (39.6%) were aged 65–74 years, and 98 (29.9%) were aged ≥75 years. Within these age groups, adverse drug reactions (ADRs) of safety specifications of any grade occurred in 46 (46.0%), 71 (54.6%), and 56 (57.1%), and of grade ≥3 in 13 (13.0%), 23 (17.7%), and 20 (20.4%), respectively. The most common ADRs of safety specifications across all age groups were thyroid dysfunction, infusion reactions, and hepatic function disorders. Median overall survival (OS) was not reached in any age group; 12‐month OS rates in patients aged ≤64, 65–74, or ≥75 years were 83.8%, 86.2%, and 80.0%, and objective response rates were 31.0%, 43.8%, and 30.6%, respectively. Discussion Analyses of PMS data show the safety and effectiveness of avelumab + axitinib across all age groups of patients with RCC in general clinical practice in Japan. The favorable benefit–risk profile was generally consistent with that observed in previous clinical trials.