Clinical Trials

Inclusion Criteria:

The main inclusion criteria include but are not limited to the following:

* Has a histologically confirmed diagnosis of locally advanced unresectable or metastatic (unresectable Stage III or Stage IV as defined by American Joint Committee on Cancer \[AJCC\] eighth edition) colorectal adenocarcinoma
* Part 2 only: Has not received systemic anticancer therapy for locally advanced unresectable or metastatic colorectal cancer
* Tumor tissue demonstrates presence of a Kirsten rat sarcoma viral oncogene homolog G12C (KRAS G12C) mutation
* Human immunodeficiency virus (HIV)-infected participants must have well controlled HIV on antiretroviral therapy (ART)
* Participants who are Hepatitis B surface antigen (HBsAg) positive are eligible if they have received hepatitis B virus (HBV) antiviral therapy and have undetectable HBV viral load
* Participants with history of hepatitis C virus (HCV) infection are eligible if HCV viral load is undetectable

Exclusion Criteria:

The main exclusion criteria include but are not limited to the following:

* Has active inflammatory bowel disease requiring immunosuppressive medication or previous clear history of inflammatory bowel disease (eg, Crohn's disease, ulcerative colitis, chronic diarrhea)
* Has uncontrolled, significant cardiovascular disease or cerebrovascular disease
* Has known dihydropyrimidine dehydrogenase (DPD) deficiency
* HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease
* Has received prior systemic anticancer therapy including investigational agents within 4 weeks before randomization
* Has 1 or more conditions that, in the opinion of the investigator, make the participant ineligible for treatment with bevacizumab
* Has known additional malignancy that is progressing or has required active treatment within the past 3 years
* Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis or leptomeningeal disease
* Has active infection requiring systemic therapy
* Has not adequately recovered from major surgery or have ongoing surgical complications
* Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease