- Cohort A1: Non-squamous NSCLC, with no activating EGFR mutations, ALK or ROS1 translocations/rearrangements. If monotherapy pembrolizumab is available as a standard of care treatment option, patients must have a tumor proportion score (TPS) <50% for PD L1 (via the 22C3 pharmDx or the Ventana (SP263) PD L1 IHC assay).