RecruitingPhase 2Drug trialMonthly Alternating NALIRIFOX and GnP in the First-Line Setting for Metastatic Pancreatic Ductal AdenocarcinomaA prospective, interventional, single-center, single-arm, open-label, phase II study for patients with metastatic pancreatic cancer. The intervention consists of monthly alternating standard chemotherapy regimens-NALIRIFOX and GnP. The hypothesis is that induction therapy with alternating NALIRIFOX and GnP has better efficacy compared to historical observation.