In order to further explore the prognostic value of SAA1, a subgroup analysis was performed by subdividing patients with different features (age: ≥60 vs. <60, grade: G3/G4 vs. G1/G2, T stage: T2/T3 vs. T1, N stage: N1 vs. N0, M stage: M1 vs. M0, TNM stage: II-IV vs. I, tumor size: ≥7 cm vs. <7 cm, PD-L1: high vs. low) into high-risk and low-risk subgroups (Supplemental Figure S1). The gene discussed is CD274; the disease is neoplasm.