A Phase Ib Study of PRJ1-3024 for Treatment of Advanced or Metastatic Melanoma

Inclusion Criteria:• Histologically or cytologically confirmed locally advanced (unresectable) or metastatic melanoma (with the exception of ocular uveal melanoma). Patients who have progressed or relapsed after at least 1st-line systemic standard therapy.

* Male or non-pregnant, non-lactating female subjects aged ≥18 years.
* ECOG Performance Status 0\~1.
* Has at least 1 measurable lesion as defined by RECIST 1.1 criteria.
* Life expectancy of ≥3 months, in the opinion of the Investigator.
* Able to take oral medications and willing to record daily adherence to investigational product.
* Adequate hematologic parameters.
* Adequate renal and hepatic function
* Able to understand and willing to sign a written informed consent form.
* Consent to provide archived tissue specimen or tissue sample.

Exclusion Criteria:• History of another malignancy.

* Known symptomatic brain metastases requiring \>10 mg/day of prednisolone.
* Significant cardiovascular disease.
* Known active HBV, HCV, AIDS-related illness.
* Has received a live vaccine within 30 days.
* History of active autoimmune disorders, or ongoing immunosuppressive therapy.
* Continuance of toxicities due to prior radiotherapy or chemotherapy agents that do not recover to \< Grade 2.
* Receiving concurrent anti-cancer therapy, investigational product, strong inhibitors or inducers of cytochrome P450 3A (CYP3A) .
* Prior treatment with other hematopoietic progenitor kinase 1 (HPK1) inhibitors.
* Allergy to the ingredients of study drug, or a history of other allergies which were judged by the investigator to be unsuitable for participation in the study.