CDKN2A and small cell lung carcinoma: Differential expression analysis and correlation analysis of the nine TFS showed that FOXA1 was not only highly expressed in SCLC [SMD = 0.91 (0.39–0.44), Fig. 5A), yet at least three data sets indicated that FOXA1 expression in SCLC was positively linked with CDKN2A expression (p ≥ 0.3, p < 0.05).