RecruitingDrug trialA Study of ART0380 for the Treatment of Advanced or Metastatic Solid TumorsThis clinical trial is evaluating a drug called ART0380 in participants with advanced or metastatic solid tumors. The main goals of this study are to: * Find the recommended dose of ART0380 that can be given safely to participants alone and in combination with gemcitabine or irinotecan * Learn more about the side effects of ART0380 alone and in combination with gemcitabine or irinotecan * Learn more about the effectiveness of ART0380 alone and in combination with gemcitabine or irinotecan