ASCL1 and small cell lung carcinoma: summarized the previous nomenclature of SCLC subtypes and proposed categorizing SCLC into the SCLC‐A, SCLC‐N, SCLC‐Y, and SCLC‐P subtypes based on the expression of ASCL1, NEUROD1, YAP1, and POU2F3, respectively.[20] Among 81 primary tumors,[3a] SCLC‐A was found to be the most common subtype, followed by SCLC‐N, SCLC‐Y, and SCLC‐P.