In contrast, our analysis revealed that low expression of XIAP does not correlate with a favorable prognosis in KRAS mutant lung cancer, including both LUAD and LUSC (Figure S3A–F, Supporting Information), indicating that the expression level of XIAP might not be used as an independent prognostic marker in these subsets of KRAS mutant lung cancer. This evidence concerns the gene KRAS and lung carcinoma.