Outcomes Following First-Line Immune Checkpoint Inhibitors With or Without Chemotherapy Stratified by KRAS Mutational...

Prior studies evaluating the efficacy of first line (1 L) immune checkpoint inhibitor (ICI) monotherapy or combined chemoimmunotherapy in advanced NSCLC found improved outcomes with chemoimmunotherapy independent of PD-L1 and KRAS mutation status. As such, combined chemoimmunotherapy was proposed as the preferred comparator arm for 1 L trials in KRAS mutated (KRAS mt) NSCLC. Herein, we report a multimodal, real world data (RWD) analysis for outcomes with 1 L therapy in patients with advanced NSCLC stratified by KRAS mutation status and PD-L1 levels.

Deidentified, multimodal RWD from the Tempus database was utilized to retrospectively analyze 1980 patients with advanced NSCLC receiving 1 L ICI containing therapy. Patients were stratified by tumor KRAS mutational status. Subgroup analyses were performed using Cox model stratified by KRAS mutational status, PD-L1 levels, and the presence of pathogenic alterations in STK11, KEAP1 and TP53.

KRAS mutations were identified in 33.4% (662/1980) of patients. There was a higher proportion of PD-L1 high tumors in the KRASmt to KRAS wild-type cohort. Among KRASmt NSCLC, median overall survival (mOS) was longest in the PD-L1 high cohort. Patients with KRAS G12C and PD-L1 high tumors had the longest mOS at 30.28 months. Finally, pathogenic mutations in KEAP1 and STK11 correlated with worse outcomes in KRASmt tumors.

Outcomes following 1 L therapy in KRASmt advanced NSCLC varied based on PD-L1 levels and the presence of STK11 and KEAP1 co-mutations, indicating that KRASm NSCLC represents a heterogeneous disease.