A trend of higher PD-L1 expression was noted in patients younger than 50 years, and in patients with low-grade tumors (grade 1/2), early stage tumors (stage I), smaller tumor size (tumor diameter ≤3 cm), or superficial myometrial invasion (≤1/2), although this did not reach statistical significance (P > 0.05) (Supplementary Figure 2). Here, CD274 is linked to neoplasm.