This study is designed to characterize the safety, tolerability, and anti-tumor activity of MDX2004 in patients with advanced tumors.

Inclusion Criteria:

• Participant must be ≥ 18 years of age.
• Histologically or cytologically confirmed diagnosis of locally advanced or metastatic malignancy.
• Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• All participants should have at least 1 measurable site of disease according to RECIST v1.1. An irradiated lesion can be considered measurable only if progression has been demonstrated on the irradiated lesion.
• Adequate hematologic, hepatic and renal function.
• All contraceptive use by men and women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies.
• Capable of giving signed informed consent.

Exclusion Criteria:

• Any clinically significant cardiac disease.
• Unresolved toxicities from previous anticancer therapy.
• Known untreated, active, or uncontrolled brain metastases.
• Previous Grade 3 or 4 immune-related toxicity that led to the discontinuation of treatment, within 6 months prior to the first dose of MDX2004.
• Active medical condition requiring chronic systemic steroid use (>10 mg/day prednisone or equivalent) or immunosuppressive therapy, within 6 months prior to the first dose of MDX2004.
• Known positivity with human immunodeficiency virus (HIV), known active hepatitis B or C, or uncontrolled chronic or ongoing infection requiring intravenous treatment.
• Prior solid organ or hematologic transplant
• Require supplemental oxygen for activities of daily living
• Participant is not suitable for participation, whatever the reason, as judged by the Investigator including medical or clinical conditions.