Multiple Therapies for Non-small Cell Lung Cancer

Inclusion Criteria for Neoadjuvant Therapy: * Pathologically documented NSCLC: * Newly diagnosed early-stage NSCLC stages IB, IIA, IIB, IIIA, or selected IIIB (T3N2 only) NSCLC of squamous or non-squamous histology. Staging should be based on the 8th edition of the American Joint Committee on Cancer (AJCC)/Union Internationale Contre le Cancer (UICC) NSCLC staging system * T4 primary NSCLC will be allowed only on the basis of size. Invasion of the diaphragm, mediastinum, heart, great vessels, trachea, recurrent laryngeal nerve, esophagus, vertebral body, carina, and separate tumor nodules in a different ipsilateral lobe is not permitted * All participants will undergo clinical staging using computed tomography (CT) and positron emission tomography (PET) scanning, as well as brain imaging using magnetic resonance imaging (MRI). Invasive mediastinal staging by either mediastinoscopy or endo-bronchial ultrasonography is highly encouraged for participants with radiographically suspected mediastinal nodal disease (i.e., N2) but not mandated if the CT or PET scans showed no evidence of N2 disease * Molecular testing results from clinical laboratory improvement amendments (CLIA)-certified laboratories and showing at least one of the following abnormalities: ALK fusion, ROS1 fusion, NTRK1/2/3 fusion; BRAF V600 mutation, RET fusion, PD-L1 expression in ≥ 1% tumor cells as determined by Food and Drug Administration (FDA)-approved test, KRAS G12C mutation * Measurable disease, as defined by RECIST v1.1 * NSCLC must have a solid or subsolid appearance on CT scan and cannot have a purely ground glass opacity appearance. For subsolid lesions, the tumor size (i.e., clinical T stage) should be measured based on the solid component only, exclusive of the ground glass opacity component * Evaluated by the attending surgeon prior to study enrollment to verify that the primary tumor and any involved lymph nodes are technically completely resectable and verify that the participant is medically operable * Adequate pulmonary function to be eligible for surgical resection with curative intent * Adequate cardiac function to be eligible for surgical resection with curative intent * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 * Adequate hematologic and end-organ function * Negative hepatitis B surface antigen (HBsAg) test at screening for cohort * Negative total hepatitits B core antibody (HBcAb) test at screening for cohort, or positive total HBcAb test followed by a negative hepatitis B virus (HBV) deoxyribonucleic acid (DNA) test at screening * Negative hepatitis C virus (HCV) antibody test at screening, or positive HCV antibody test followed by a negative HCV ribonucleic acid (RNA) test at screening * Male participants must be willing to use acceptable methods of contraception * Female participants of childbearing potential must agree to use acceptable methods of contraception Inclusion Criteria for Adjuvant Therapy (TKI Cohorts and KRAS G12C cohort \[if continuing on Divarasib\]): * Participants whose tumors lack radiographic progression * ECOG Performance Status of 0 or 1 * Adequate hematologic and end-organ function Exclusion Criteria * NSCLC that is clinically T4 by virtue of mediastinal organ invasion or Stage IIIB by virtue of N3 disease * Any prior therapy for lung cancer, including chemotherapy, targeted therapy, immunotherapy, or radiotherapy, within 2 years * Participants with prior lung cancer * Major surgical procedure within 28 days prior to Cycle 1, Day 1 * Malignancies other than the disease under study within 3 years prior to Cycle 1, Day 1, with the exception of participants with a negligible risk of metastasis or death and with expected curative outcome * Treatment with an investigational agent for any condition within 4 weeks prior to Cycle 1, Day 1 * Participants known to be positive for human immunodeficiency virus (HIV) are excluded if they meet any of the following criteria: cluster of differentiation 4 (CD4)+ T-cell count of \<350 cells/microliters (cells/µL); detectable HIV viral load; history of an opportunistic infection within the past 12 months; on stable antiretroviral therapy for \<4 weeks * Severe infection within 4 weeks prior to initiation of study treatment, including but not limited to hospitalization for complications of infections, or any active infection that, in the opinion of the investigator, could impact participant safety * Pregnant or lactating, or intending to become pregnant during the study