Outcomes of first-line chemo-immunotherapy in advanced non-squamous NSCLC according to KRAS status: An Italian real-world study.

IntroductionChemo-immunotherapy is the standard frontline treatment of advanced non-squamous non-small cell lung cancer (nsq-NSCLC). Among oncogenic drivers, KRAS mutation accounts for approximately 25% of lung adenocarcinomas, with p.G12C being the most common variant. This study assessed clinical features and survival outcomes according to KRAS mutation in a real-life population of nsq-NSCLC patients treated with first-line platinum-pemetrexed-pembrolizumab.MethodsThis is a retrospective-prospective study including patients with nsq-NSCLC who received first-line platinum-pemetrexed-pembrolizumab from 4 September 2018 in 33 Italian Centers.ResultsAmong the 765 patients included in this analysis, 121 (15.8%) had KRAS p.G12C mutation, 201 (26.3%) KRAS non-p.G12C mutation and 443 (57.9%) KRAS WT. KRAS-mutated patients had more frequently a history of smoking (90.6% vs 84.1%, p=0.012) and bone metastases (44.1% vs 35.9%; p=0.022) compared to KRAS WT.Median Overall Survival (OS) was similar between KRAS-mutated and KRAS WT patients (16.7 vs 18.2 months; adjusted Hazard Ratio [HR] 1.19, 95% Confidence Interval [CI] 0.95-1.50, p=0.132). No difference in OS was found between KRAS p.G12C and KRAS non-p.G12C (15.9 vs 17.0 months, HR 0.93, 95% CI: 0.66-1.31, p=0.676).Median progression-free survival was significantly shorter in KRAS-mutated compared to KRAS WT patients (8.8 vs 10.8 months; adjusted HR 1.29, 95% CI 1.04-1.59, p=0.018), with no differences between KRAS p.G12C and KRAS non-p.G12C (8.8 vs 8.8 months, HR 0.95, 95% CI: 0.70-1.30, p=0.756).ConclusionsKRAS mutation showed a potential negative predictive role in advanced nsq-NSCLC treated with first-line chemo-immunotherapy. The impact of co-mutations and post-progression outcomes warrants further investigation.