KEAP1 and squamous cell carcinoma: In our analysis of the TCGA lung cancer dataset, where protein expression levels were accessible, we found no significant differences in PD-L1 expression levels between tumors harboring wild-type and mutant KEAP1/STK11, both in adenocarcinoma (TCGA-LUAD) and squamous cell carcinoma (TCGA-LUSC) (Figure 3a).