Interventional Study of INCB 99280 With Ipilimumab in Participants With Select Solid Tumors

Inclusion Criteria

• Prior systemic therapy, diagnoses and disease setting as follows:
• For Part 1 (dose escalation), and no history of treatment with anti-CTLA-4 or anti-PD-(L)1 therapy and one of the following,
• Unresectable or metastatic cutaneous melanoma, or
• Unresectable of metastatic Child-Pugh Class A NDD not eligible for surgical and/or locoregional therapy, or
• Intermediate or poor-risk advanced clear cell RCC, or
• MSI-H or dMMR metastatic CRC and able to provide fresh or archival tumor tissue for central confirmation of MSI-H or dMMR.
• For Part 2 (dose expansion), IO treatment -naïve, e.g., no prior receipt of an anti PD-1, anti-PD-L1 or PD-L1, anti-CTLA-4, GITR, LAG3, TIM3, OX-40, IL-2, 4-1BB or other immune modulator, and have not received prior systemic therapy and one of the following,
• Unresectable or metastatic Child-Pugh Class A HCC not eligible for surgical and/or locoregional therapy, or
• Intermediate - or poor-risk advanced clear cell RCC.
• ECOG performance score of 0 or 1.
• Life expectancy > 3 months, in the opinion of the investigator.
• Histologically confirmed solid tumors with measurable disease per RECIST v1.1.
• Exception: HCC may be diagnoses based on cross-sectional multiphasic imagining using the AASLD criteria.
• Willingness to avoid pregnancy or fathering children.

Exclusion Criteria

• Known history of an additional malignancy.
• Central nervous system (CNS) metastases requiring treatment and/or leptomeningeal disease.
• Toxicity from prior therapy that has not recovered.
• Received thoracic radiation within 6 months of the first dose of study treatment.
• Participation in another interventional clinical study while receiving INCB099280.
• Impaired cardiac function of clinically significant cardiac disease.
• History of evidence of interstitial lung disease including non-infections pneumonitis.
• Presence of gastrointestinal condition that may affect drug absorption
• Any autoimmune disease requiring systemic treatment in the past 5 years.
• Diagnosis of immunodeficiency or receiving chronic systemic steroid therapy at a daily dose exceeding 10 mg of prednisone or equivalent
• Active infection requiring systemic therapy.
• History of organ transplantation, including allogeneic stem cell transplantation.
• Receipt of system antibiotics within 28 days of first dose of study treatment.
• Probiotic usage is prohibited during the screening and throughout the study treatment period.
• Received a live vaccine within 28 days of planned start of study drug.
• Laboratory values outside the Protocol-defined ranges. Other protocol-defined Inclusion/Exclusion Criteria may apply.