STK11 and squamous cell lung carcinoma: Among the immune cell populations of the innate immunity, macrophages of the M2 phenotype showed a negative correlation with the co-expression of PEBP1/STK11 in several cancer types, including colorectal adenocarcinoma (COAD), bladder urothelial carcinoma (BLCA), chromophobe renal cell carcinoma (KICH), KIRC, GBM, and lung squamous cell carcinoma (LUSC).