The main objective of this study is to evaluate the tumor objective response rate (ORR) assessed by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria in participants who receive sotorasib at either 960 mg daily or 240 mg daily whose tumors are programmed death-ligand 1 (PD-L1) Tumor Proportion Score (TPS) < 1% and/or harbor a serine/threonine kinase 11 (STK11) co-mutation, in a subgroup of participants with PD-L1 < 1% and in a subgroup of participants with STK11 co-mutation.

Inclusion Criteria:

• Adult (= or > 18 years old) with NSCLC
• Untreated Stage IV metastatic disease. Participants who received adjuvant or neoadjuvant anti-tumor therapy are eligible if the adjuvant/neoadjuvant therapy was completed greater than 12 months prior to the development of metastatic stage IV disease
• Pathologically documented metastatic NSCLC with KRAS G12C mutation (local confirmation)
• Programmed death-ligand 1 (PD-L1) TPS Score < 1% and/or serine/threonine kinase 11 (STK11) co-mutation (local confirmation)
• Eastern Cooperative Oncology Group (ECOG) score of 0 or 1
• No active brain metastases
• Measurable disease per investigator interpretation using Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 criteria

Exclusion Criteria:

• Mixed small-cell lung cancer and NSCLC histology
• Myocardial Infarction within 6 months of study Day 1
• Use of proton-pump inhibitors (PPIs), histamine (H2) receptor antagonists (H2RA), strong inducers of cytochrome P450 (CYP) 3A4 (CYP3A4) or known CYP3A4 sensitive substrates or P-gp substrates
• Therapeutic or palliative radiation therapy within 2 weeks of study day 1
• Unable to take oral medication
• Unable to receive both iodinated contrast for computed tomography (CT) scans and gadolinium contrast for magnetic resonance imagine (MRI) scans

De-identified individual patient data for variables necessary to address the specific research question in an approved data sharing request

Data sharing requests relating to this study will be considered beginning 18 months after the study has ended and either 1) the product and indication have been granted marketing authorization in both the US and Europe or 2) clinical development for the product and/or indication discontinues and the data will not be submitted to regulatory authorities. There is no end date for eligibility to submit a data sharing request for this study.

Qualified researchers may submit a request containing the research objectives, the Amgen product(s) and Amgen study/studies in scope, endpoints/outcomes of interest, statistical analysis plan, data requirements, publication plan, and qualifications of the researcher(s). In general, Amgen does not grant external requests for individual patient data for the purpose of re-evaluating safety and efficacy issues already addressed in the product labelling. Requests are reviewed by a committee of internal advisors. If not approved, a Data Sharing Independent Review Panel will arbitrate and make the final decision. Upon approval, information necessary to address the research question will be provided under the terms of a data sharing agreement. This may include anonymized individual patient data and/or available supporting documents, containing fragments of analysis code where provided in analysis specifications. Further details are available at the URL below.