STK11 and non-small cell lung carcinoma: Frequently co-mutated TSGs in KRAS-mutated NSCLC include serine/threonine kinase 11 (STK11)/liver kinase B1 (LKB1), kelch-like ECH-associated protein 1 (KEAP1), tumor protein 53 (TP53), and cyclin-dependent kinase inhibitor 2A/B (CDKN2A/B).29