CDKN2C and small cell lung carcinoma: FOXA1 expression may contribute to the increased CDKN2C expression level in SCLC owing to the following: (1) similar to CDKN2C, it was an Up-DEG in SCLC; (2) it was positively associated with CDKN2C expression; and (3) the chromatin immunoprecipitation sequencing data support the finding.