Study of JAB-23E73 in Combination With Chemotherapy in Participants With Metastatic PDAC Harboring KRAS Gene Alterations

Inclusion Criteria: 1.Written informed consent signed by the participant or the participant's legally authorized representative must be obtained prior to performing any study-related procedures. 2. Histologically or cytologically confirmed metastatic PDAC. 3\. No prior systemic antitumor therapy for advanced disease (treatment-naïve). 4. Presence of KRAS gene alterations: be enrolled upon approval by the sponsor). 5\. ECOG performance status score of 0 or 1. 6. Adequate organ function. Exclusion Criteria: 1. Inability to swallow oral medications or the presence of gastrointestinal dysfunction or disease that may significantly alter drug absorption. 2. A history of another malignancy within 2 years prior to the first dose, histologically distinct from the cancer under study, except for carcinoma in situ of the cervix, superficial non-invasive bladder cancer, or adequately treated stage I non-melanoma skin cancer. 3. Prior treatment with KRAS G12C inhibitors, KRAS G12D inhibitors, pan-KRAS inhibitors, or other agents of the same class. 4. Primary central nervous system (CNS) tumors. 5. Women who are pregnant or breast-feeding. 6. Participants who have progressive disease or recurrence during neoadjuvant or adjuvant treatment, or within 6 months after the last dose of medication.