PD-1 and PD-L1 have been very successful for the treatment of various tumors, including NSCLC, urothelial cancer, melanoma, head and neck squamous cell cancer, and lymphoma. Researchers identified compound L7 as a potent PD-L1 inhibitor that blocked PD-1/PD-L1 interaction. Pharmacokinetic (PK) studies demonstrated that L7 was orally bioavailable. PK studies were conducted by Medicilon.

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