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

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 Castlema…