According to the relative expression levels of 17 cohesin‐associated gene (i.e., RAD21, SMC1A, SMC3, STAG1, STAG2, CDCA5, MAU2, NIPBL, PDS5A, PDS5B, WAPL, AURKB, CDK1, ESPL1, PLK1, PTPA, and SGO1), a cohesin‐associated gene score may be calculated to portray the molecular characteristics of hepatocellular carcinoma. Here, STAG1 is linked to hepatocellular carcinoma.