Unresectable Locally Advanced or Metastatic Melanoma

This is an open-label, multicenter Phase I/II clinical study conducted in participants with unresectable locally advanced or metastatic melanoma and urinary tract tumors, aiming to evaluate the safety, tolerability, pharmacokinetic characteristics, and efficacy of JMT108 Injection in this population. The study consists of Phase I and Phase II (including Phase IIa and Phase IIb), where Phase I is the dose-escalation stage, Phase IIa is the dose-expansion stage, and Phase IIb is the cohort-expansion stage.