Summary
This study has three parts: Dose Optimisation, Experimental Part A and Experimental Part B.
Dose Optimisation:The first part is seeking to determine the optimal dose of a new targeted therapy (called LY3537982). Eligible participants will randomly be allocated to receive LY3537982 (dose level 1 or 2) plus Pembrolizumab immunotherapy.
Experimental Part A: Participants will randomly be allocated to receive LY3537982 in combination with Pembrolizumab immunotherapy, or receive Placebo in combination with Pembrolizumab immunotherapy.
Experimental Part B: Safety Lead-In (single-arm, non-randomised) Participants will receive LY3537982 in combination with pembrolizumab immunotherapy, pemetrexed chemotherapy, and platinum chemotherapy (cisplatin or carboplatin).
Participants will randomly be allocated to receive LY3537982 in combination with pembrolizumab, pemetrexed, and platinum (cisplatin or carboplatin), or receive Placebo in combination with pembrolizumab, pemetrexed chemotherapy , and platinum chemotherapy (cisplatin or carboplatin).
All treatment cycles are 21 days. LY3537982 and its placebo will be administered orally. Pemroblizumab, pemetrexed and platinum (cisplatin or carboplatin) will be administered intravenously. All participants may continue to receive treatment until discontinuation criteria are met.