The authors identified SCLC-I as a SCLC subtype according to Gay et al.’s classification, where the inflammatory SCLC subtype (SCLC-I) was described as the fourth subtype, replacing SCLC-Y, since YAP1 expression alone did not exclusively define SCLC-I [12,43]. Here, YAP1 is linked to small cell lung carcinoma.