A First in Human Study of PLT012 in Participants With Solid Tumor Cancers

Inclusion Criteria: * Aged at least 18 years and provided written informed consent * Histologically or cytologically confirmed advanced solid tumors (except primary CNS malignancies) * Has at least one measurable lesion per RECIST v1.1 * ECOG PS of 0 to 1 * Life expectancy of ≥ 12 weeks * Child-Pugh score of Class A (for hepatocellular carcinoma only) * Adequate organ function as defined by protocol-specified laboratory values * Not pregnant or breastfeeding Exclusion Criteria: * Insufficient washout period from prior therapies as defined in the study protocol * Ongoing Grade 2 or higher toxicities from prior treatments (with some exceptions) * Concurrent or recent (within 2 years) malignancy other than the disease under study (with some exceptions) * Uncontrolled HIV, uncontrolled hepatitis B, or uncontrolled acute hepatitis C infections * Unstable/uncontrolled or untreated central nervous system (CNS) metastasis * Active or recent (within 3 years) autoimmune disease requiring medical treatment * Recipient of any organ transplant including allogeneic stem-cell transplant * Clinically significant and active cardiovascular disease * Known active alcohol or drug abuse * Psychiatric disorders that would prohibit the understanding of the Informed Consent Form * Ascites requiring therapeutic paracentesis or hepatic encephalopathy requiring medical interventions within the past 6 months (if hepatocellular carcinoma)