PPP1R12A and metastatic malignant neoplasm in the lymph nodes: Poor differentiation (HR = 2.310, P = 0.011), high lymph node metastasis (lymph  node ≥ 4: HR = 2.750, P = 0.001), high TNM stage (IIIC: HR = 3.613, P < 0.001), and low PPP1R12A RCN (RCN < 0.37: HR = 2.782, P < 0.001) were shown to be significantly associated with poor OS.