This Phase Ib/III study evaluates the efficacy and safety of IBI351 in combination with chemotherapy in advanced non-squamous NSCLC with KRAS G12C mutation.

This Phase Ib/III study evaluates the efficacy and safety of IBI351 in combination with chemotherapy. There will be five cohorts of subjects, all of whom have KRAS G12C mutation and have advanced or metastatic NSCLC. Those five cohorts (A, B,C ,D and E) are treated with IBI351, IBI351+Sintilimab,IBI351+pemetrexed+cis-platinum/carboplatin,IBI351+Cetuximab, or IBI351+pemetrexed+cis-platinum/carboplatin respectively.

IBI351 is an orally available small molecule inhibitor of KRAS G12C.

Inclusion Criteria:

1. Histologically confirmed diagnosis of nonsquamous NSCLC with KRAS G12C mutation
2. Unresectable or metastatic disease
3. Adequate organ function
4. Not received any systemic antitumor therapy for locally advanced or metastatic non-squamous NSCLC previously.

Exclusion Criteria:

1. History of intestinal disease or major gastric surgery or inability to swallow oral medications
2. Prior therapy with agents targeting KRAS G12C mutation (e.g., AMG 510).
3. Active brain metastases.