RecruitingPhase 1Biological interventionYMN-136 Vaccine for Patients With Advanced Hepatobiliary and Pancreatic MalignanciesThis study aims to determine the safety and maximum tolerated dose (MTD) of YMN-136 vaccine through a dose escalation trial, and to investigate whether YMN-136 vaccine can assist in the treatment of patients with advanced hepatobiliary and pancreatic malignancies.