Figure 1. Typical patterns of HE staining and corresponding PD-L1 IHC staining (200X) about LUSC and LUAD. (A–F) are about LUSCs. (A–C) are HE staining; (D–F) are the corresponding PD-L1 IHC staining: (D) is negative (<1%), (E) is low expression (1%~49%), and (F) is high expression (≥50%). (G–L) are about LUADs. (G–I) are HE staining; (J–L) are the corresponding PD-L1 staining: (J) is negative, (K) is low expression, and (L) is high expression.