A Clinical Study of Calderasib (MK-1084) With Targeted Therapy and Chemotherapy in People With Colorectal Cancer (MK-1084-012/KANDLELIT-012)

Open to people ages 18 years and up

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; an exception is permitted for 1-2 cycles of FOLFOX or 1 cycle of CAPOX as optional chemotherapy before or during the screening period
• 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

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 partial or complete 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, with the exception of the optional chemotherapy
• 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