The study cohort of NSCLC patients was established by recruiting patients from Yonsei Cancer Center, Seoul, Korea. Eighteen patients were in the discovery cohort, whereas 56 were in the validation cohort. Each patient was administered either nivolumab or pembrolizumab. Patients were classified as responders if they showed partial response (PR) or stable disease (SD) for >6 months according to Response Evaluation Criteria in Solid Tumors (RECIST) ver. 1.120 (link). Patients who showed progressive disease (PD) or SD for ≤6 months were classified as non-responders by RECIST ver. 1.121 (link). Computed tomography (CT) studies were independently read by radiologists. All tumor samples were obtained from patients before immunotherapy.
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