PPP1CC and laryngotracheoesophageal cleft: Four survival-associated genes (RGS5, SULT1C2, ACSM3, CXCL14) and ten hub genes (CCNB2, CDC25C, NEK2, CDCA5, CDK1, PPP1CA, PPP1CC, PPP1CB, CAMK2B, CDC20) consistently emerged as key drivers of LC progression.