The CDKN2A mRNA expression in SCLC (n = 357) was elevated remarkably as compared to the control group [n = 525, SMD = 3.07 (95%CI: 2.13–4.02); Fig. 2A] with no discernible publication bias (p = 0.170; Fig. 2B). Here, CDKN2A is linked to small cell lung carcinoma.