Inclusion Criteria:

1. Subjects must have mCRPC,RCC, MEL, or NSCLC, that is advanced (non-resectable), or recurrent and for which no alternative, curative standard exists.
2. ECOG Performance Status of 0-2
3. Must have at least 1 measurable lesion
4. Subjects with mCRPC and with only non-measurable bone lesions must have either progression new lesions or have PSA progression within the 6-week period before study administration
5. At least 1 and up to 5 prior systemic therapies for advanced/recurrent disease
6. Prior treated brain or meningeal metastases must be without MRI evidence of progression for at least 8 weeks and off immunosuppressive doses of systemic steroids for at least 2 weeks before study drug administration
7. Prior systemic radiation therapy must have been completed at least 4 weeks before study drug administration. Prior focal radiotherapy completed at least 2 weeks prior to study drug administration.
8. Immunosuppressive doses of systemic medications, such as steroids or absorbed topical steroids must be discontinued at least 2 weeks before study drug administration
9. Prior surgery that required general anesthesia must be completed at least 2 weeks before study drug administration. surgery requiring local/epidural anesthesia must be completed at least 72 hours before study drug administration

Exclusion Criteria:

1. History of severe hypersensitivity reactions to other mAbs;
2. Subjects with any active autoimmune disease or a documented history of autoimmune disease, or history of syndrome that required systemic steroids or immunosuppressive medications, except for subjects with vitiligo or resolved childhood asthma/atopy;
3. Prior therapy with an anti-PD-1, anti-PD-L1, anti-PDL-2, or anti-CTLA-4 antibody (or any other antibody targeting T cell co-stimulation pathways);
4. Known history of Human Immunodeficiency Virus;
5. Active infection requiring therapy, positive tests for Hepatitis B surface antigen or Hepatitis C ribonucleic acid (RNA);
6. Underlying medical conditions that will make the administration of study drug hazardous
7. Concurrent medical condition requiring the use of immunosuppressive medications, or immunosuppressive doses of systemic or absorbable topical corticosteroids;
8. Use of other investigational drugs (drugs not marketed for any indication) within 28 days or at least 5 half-lives (whichever is longer) before study drug administration;