PER1 and hepatocellular carcinoma: SNPs in PER1 (rs3027178), PER3 (rs228669 and rs2640908), and CRY1 (rs3809236) were significantly linked to overall survival rate, while SNPs in PER1 (rs3027178), PER3 (rs228729), and CRY1 (rs3809236) were significantly related to RFS of HCC patients.