COM701 in Combination With BMS-986207 and Nivolumab in Subjects With Advanced Solid Tumors.

Key Inclusion Criteria:

* Histologically or cytologically confirmed, locally advanced or metastatic solid malignancy and has exhausted all available standard therapy or is not a candidate for the available standard therapy.
* Eastern Cooperative Oncology Group (ECOG) performance status 0-1.
* During dose escalation - Subjects who received prior therapy with anti-PD-1, anti-PD-L1, anti- CTLA-4, OX-40, CD137, etc., are eligible.

During cohort expansion: All subjects must have measurable disease as defined by RECIST v1.1.

Expansion Cohorts:

* Cohort 1 (subjects with advanced epithelial ovarian, fallopian tube, or primary peritoneal carcinoma)
* Subject must have platinum refractory/resistant ovarian cancer defined as refractoriness to platinum-containing regimen or disease recurrence \< 6 months after completion of a platinum-containing regimen
* Cohort 2 (endometrial cancer cohort)
* Subjects with locally advanced or metastatic microsatellite stable endometrial cancer with disease recurrence or progression during or after prior therapy that included platinum-based chemotherapy.
* Subjects must have documented MSS status by an approved test e.g. genomic testing, IHC for mismatch repair proficient.
* Subjects must have received no more than 2 prior systemic cytotoxic therapies; there are no limits to the number of prior endocrine or antiangiogenic regimens
* Cohort 3 (basket cohort, excludes tumor types in cohorts 1 and 2)
* Tumor types with high expression of PVRL2 (determined by central testing).
* Cohort 4 (Head and Neck cancer)
* Histologically confirmed recurrent or metastatic HNSCC (oral cavity, oropharynx, larynx, hypopharynx, nasopharynx, paranasal sinus, nasopharyngeal)
* Cohort 4a - IO naïve. Eligible subjects can be systemic therapy naïve (frontline) or platinum failure.
* Cohort 4b - IO failure. No limitations on the number of prior lines of systemic therapy.

Key Exclusion Criteria:

* Active autoimmune disease requiring systemic therapy in the last 2 years prior to the first dose of COM701.
* Symptomatic interstitial lung disease or inflammatory pneumonitis.
* History of immune-related events that lead to immunotherapy treatment discontinuation.
* Untreated or symptomatic central nervous system (CNS) metastases.

Key Exclusion Criteria For Dose Expansion Cohorts:

* Cohort 1: Prior therapy with an anti-PD-1/PD-L1/2, COM701 (or any inhibitor of PVRIG), anti-TIGIT antibody, anti-CTLA-4 antibody, anti-OX-40 antibody, anti-CD137 antibody.
* Cohort 2: Prior therapy with COM701 (or any inhibitor of PVRIG) or anti-TIGIT antibody. Subjects with MSI-H endometrial cancer are ineligible.
* Cohort 3: Prior therapy with COM701 (or any inhibitor of PVRIG) or anti-TIGIT antibody are ineligible.
* Cohort 4: Subjects who have received prior therapy with COM701 (or any inhibitor of PVRIG), anti-TIGIT antibody, anti-CTLA-4 antibody, anti-OX-40 antibody, anti-CD137 antibody. Subjects in cohort 4a must be IO-naïve.