To characterize the safety and tolerability of NIS793 as single agent and in combination with PDR001 and to identify recommended doses for future studies.

Inclusion Criteria:

1. Written informed consent must be obtained prior to any screening procedures.

2. Patient (male or female) ≥ 18 years of age.

3. Escalation: Patients with advanced/metastatic solid tumors, with measurable or non-measurable disease as determined by RECIST version 1.1 who have progressed despite standard therapy or are intolerant of standard therapy, or for whom no standard therapy exists.

4. Expansion: Patients with advanced/metastatic solid tumors, with at least one measurable lesion as determined by RECIST version 1.1, who have progressed despite standard therapy following their last prior therapy or are intolerant to standard therapy and fit into one of the following groups: Group 1: NSCLC resistant to anti-PD-1/PD-L1; Group 2: TNBC; Group 3: HCC; Group 4: MSS-CRC; Group 5: pancreatic; Group 6 ccRCC resistant to anti-PD-1/PD-L1.

   Resistance to anti-PD-1/PD-L1 therapy is defined as: Documented progressive disease occurring while on/or within 6 months after anti-PD-1 and/or anti-PD-L1 agent (single or combination) received as the last therapy prior to enrollment.

5. ECOG Performance Status ≤ 2.

6. Patients must have a site of disease amenable to biopsy, and be a candidate for tumor biopsy. Patient must be willing to undergo a new tumor biopsy at screening, and during therapy on this study. Exceptions may be made on a case by case basis after documented discussion with Novartis.

Exclusion Criteria:

1. History of severe hypersensitivity reactions to study treatment ingredients or other monoclonal antibodies and components of study drug.
2. Patients with active, known or suspected autoimmune disease. Note: Patients with vitiligo, type I diabetes mellitus, residual hypothyroidism only requiring hormone replacement, psoriasis not requiring systemic treatment, or conditions not expected to recur in the absence of an external trigger are permitted to enroll.
3. HIV infection.
4. Active HBV or HCV infection.

Other protocol-defined inclusion/exclusion criteria may apply.