A Study of MK-6837 as a Monotherapy and Combination Therapy in Participants With Advanced/Metastatic Solid Tumors (MK-6837-001)

Inclusion Criteria:

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

* Histologically or cytologically confirmed solid tumor by pathology report that is advanced or metastatic
* 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 for at least 4 weeks, and have undetectable HBV viral load before allocation
* Participants with history of Hepatitis C Virus (HCV) infection are eligible if HCV viral load is undetectable at screening

Exclusion Criteria:

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

* Has not recovered to Common Terminology Criteria for Adverse Events (CTCAE) Grade 1 or better from any Adverse Events (AEs) that were due to cancer therapeutics administered more than 4 weeks earlier
* History of a second malignancy, unless potentially curative treatment has been completed with no evidence of malignancy for 2 years
* Has clinically significant cardiovascular disease
* HIV-infected participants with a history of Kaposi's sarcoma and/or Multicentric Castleman's Disease
* Received prior systemic anticancer therapy including investigational agents within 4 weeks before the first dose of study intervention
* Has received any prior immunotherapy and was discontinued from that treatment due to a Grade 3 or higher immune-related AE (except endocrine disorders that can be treated with replacement therapy) or was discontinued from that treatment due to Grade 2 myocarditis or recurrent Grade 2 pneumonitis
* Received prior radiotherapy within 2 weeks of start of study intervention, or has radiation-related toxicities, requiring corticosteroids
* Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines is allowed
* Diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy or any other form of immunosuppressive therapy within 7 days before the first dose of study intervention
* Known additional malignancy that is progressing or has required active treatment within the past 2 years
* Known active Central Nervous System (CNS) metastases and/or carcinomatous meningitis
* Active autoimmune disease that has required systemic treatment in the past 2 years except replacement therapy
* History of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease
* Active infection requiring systemic therapy
* History of allogeneic tissue/solid organ transplant
* Participants who have not adequately recovered from major surgery or have ongoing surgical complications