Fig. 1From: PD-L1, FGFR1, PIK3CA, PTEN, and p16 expression in pulmonary emphysema and chronic obstructive pulmonary disease with resected lung squamous cell carcinomaRepresentative image of PD-L1 expression for each staining level (10X). A TC0 and IC0 (< 1%), B TC1 and IC1 (1–4%), C TC2 and IC2 (5–49%), D TC3 and IC3 (50–100%). PD-L1 programmed death ligand 1, TC tumor cells, IC immune cellBack to article page