title: KRAS mutation is a weak, but valid predictor for poor prognosis and treatment outcomes in NSCLC: A meta-analysis of 41 studies.
abstract: Mutation of oncogene KRAS is common in non-small cell lung cancer (NSCLC), however, its clinical significance is still controversial. Independent studies evaluating its prognostic and predictive value usually drew inconsistent conclusions. Hence, We performed a meta-analysis with 41 relative publications, retrieved from multi-databases, to reconcile these controversial results and to give an overall impression of KRAS mutation in NSCLC. According to our findings, KRAS mutation was significantly associated with worse overall survival (OS) and disease-free survival (DFS) in early stage resected NSCLC (hazard ratio or HR=1.56 and 1.57, 95% CI 1.39-1.76 and 1.17-2.09 respectively), and with inferior outcomes of epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs) treatment and chemotherapy (relative risk or RR=0.21 and 0.66 for objective response rate or ORR, 95% CI 0.12-0.39 and 0.54-0.81 respectively; HR=1.46 and 1.30 for progression-free survival or PFS, 95%CI 1.23-1.74 and 1.14-1.50 respectively) in advanced NSCLC. When EGFR mutant patients were excluded, KRAS mutation was still significantly associated with worse OS and PFS of EGFR-TKIs (HR=1.40 and 1.35, 95 % CI 1.21-1.61 and 1.11-1.64). Although KRAS mutant patients presented worse DFS and PFS of chemotherapy (HR=1.33 and 1.11, 95% CI 0.97-1.84 and 0.95-1.30), and lower response rate to EGFR-TKIs or chemotherapy (RR=0.55 and 0.88, 95 % CI 0.27-1.11 and 0.76-1.02), statistical differences were not met. In conclusion, KRAS mutation is a weak, but valid predictor for poor prognosis and treatment outcomes in NSCLC. There's a need for developing target therapies for KRAS mutant lung cancer and other tumors.
authors: Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, P.R. China.|Department of Oncology, The Second Hospital of Nanjing Jiangning, Nanjing, Jiangsu, P.R. China.
authors: Wei
authors: W
authors: Pan
authors: Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, P.R. China.
authors: Yan
authors: Y
authors: Yang
authors: Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, P.R. China.
authors: Hongcheng
authors: H
authors: Zhu
authors: Department of Oncology, Nanjing Jiangning Hospital, Nanjing, Jiangsu, P.R. China.
authors: Youcheng
authors: Y
authors: Zhang
authors: Department of Oncology, Nanjing Jiangning Hospital, Nanjing, Jiangsu, P.R. China.
authors: Rongping
authors: R
authors: Zhou
authors: Department of Radiation Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, P.R. China.
authors: Xinchen
authors: X
authors: Sun
mesh_terms: D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D006801:Humans; D008175:Lung Neoplasms / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D009154:Mutation / Q000235:genetics*; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors; D011379:Prognosis; D047428:Protein Kinase Inhibitors / Q000627:therapeutic use; D016283:Proto-Oncogene Proteins p21(ras) / Q000235:genetics*; D015996:Survival Rate
chemical_list: C117307:KRAS protein, human; D009363:Neoplasm Proteins; D047428:Protein Kinase Inhibitors; D016283:Proto-Oncogene Proteins p21(ras)
keywords: EGFR-TKI; KRAS mutation; meta-analysis; non-small cell lung cancer; prognosis