CDKN1A and esophageal squamous cell carcinoma: As the CDK inhibitors P27Kip1, P21Cip1, and CDKN2C are important regulators of the cell cycle (Supplementary Figure S3), we hypothesized that LINC00673 promotes ESCC cell cycle progression by suppressing p21Cip1, p27Kip1, or CDKN2C expression.