Study of MK-1248 With and Without Pembrolizumab (MK-3475) for Participants With Advanced Solid Tumors (MK-1248-001)

A Phase 1 Trial of MK-1248 as Monotherapy and in Combination With Pembrolizumab in Subjects With Advanced Solid Tumors.

In this study, participants with advanced solid tumors were assigned to receive escalating doses of either MK-1248 alone or MK-1248 in combination with pembrolizumab (MK-3475). This study used the number of dose-limiting toxicities (DLTs) at each dose level to find and confirm the maximum tolerated dose (or maximum administered dose) for MK-1248 alone and in combination with pembrolizumab.

Inclusion Criteria:

• Histologically- or cytologically-confirmed metastatic solid tumor for which there is no available therapy that may convey clinical benefit
• Measurable disease by Response Evaluation Criteria In Solid Tumors (RECIST) 1.1 criteria
• Performance status of 0 or 1 on the Eastern Cooperative Oncology Group (ECOG) Performance Scale
• Adequate organ function
• Female participants of childbearing potential should be willing to use adequate contraception for the course of the study through 120 days after the last dose of study medication
• Male participants should agree to use adequate contraception starting with the first dose of study therapy through 180 days after the last dose of study medication
• Can submit a baseline tumor sample

Exclusion Criteria:

• Has had chemotherapy, radiation, or biological cancer therapy within 4 weeks prior to the first dose of study medication, or not recovered from adverse events due to cancer therapeutics administered more than 4 weeks earlier
• Currently participating and receiving study therapy or has participated in a study of an investigational agent and received study therapy or used an investigational device within 4 weeks of the first dose of study medication
• Previous treatment with another agent targeting the glucocorticoid-induced tumor necrosis factor receptor-related protein (GITR) receptor
• Previous treatment with an immunomodulatory therapy and was discontinued from that therapy due to an immune-related adverse event
• Expected to require any other form of antineoplastic therapy while on study
• On chronic systemic steroid therapy in excess of replacement doses, or on any other form of immunosuppressive medication
• History of a previous, additional malignancy, unless potentially curative treatment has been completed, with no evidence of malignancy for 5 years with the exception of successful definitive resection of basal cell carcinoma of the skin, superficial bladder cancer or in situ cervical cancer
• Known active central nervous system (CNS) metastases and/or carcinomatous meningitis
• Severe hypersensitivity reaction to treatment with another monoclonal antibody
• Active autoimmune disease or a documented history of autoimmune disease with the exception of vitiligo or resolved childhood asthma/atopy, or endocrine deficiency following treatment with an immunomodulatory agent
• Active infection requiring therapy
• Active or a history of non-infectious pneumonitis
• Prior stem cell or bone marrow transplant
• Known history of human immunodeficiency virus (HIV), active chronic or acute hepatitis B or C
• Known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the study
• Regular user (including "recreational use") of any illicit drugs or had a recent history (within the last year) of substance abuse (including alcohol), at the time of signing informed consent
• Symptomatic ascites or pleural effusion
• Pregnant, breastfeeding, or expecting to conceive or father children within the projected duration of the study through 180 days after the last dose of study medication
• Major surgery within 16 weeks prior to screening
• Live vaccine within 30 days prior to first dose of study medication