highly significantP < 0.001
This was particularly evident in the age ≥ 65 years group, White race group, female group, T1-2 stage group, N0 stage group, M1 stage group, surgery group, tumor size < 5.0 cm group, non-chemotherapy group, and mitotic rate ≥ 5/50 HPF group, where the difference was highly significant ( P < 0.001) ( Figure 3 ).