Reduced CT + Anti-PD-1 as First Line Tx in Vulnerable Older Adults w/Adv <50% PD-L1 Non-Small Cell Lung Cancer (NSCLC)

Eligible participants with recurrent or metastatic squamous cell carcinoma will receive 4 cycles of carboplatin area under the curve (AUC) 3 IV every 21 days and paclitaxel 135 mg/m2 intravenous (IV) every 21 days. Participants with non-squamous histology will receive carboplatin AUC 3 IV every 21 days and pemetrexed 375 mg/m2 IV every 21 days (collectively, induction chemotherapy). Both groups will receive pembrolizumab 200 mg IV every 21 days for a total of up to 35 cycles (Cycles ≥5 are collectively the maintenance portion of treatment) or until disease progression or unacceptable toxicity.