Study of Efficacy and Safety of NIS793 in Combination With Standard of Care (SOC) Chemotherapy in First-line Metastatic Pancreatic Ductal Adenocarcinoma (mPDAC) - daNIS-2

Inclusion Criteria: * Applicable for both Safety run-in and Randomized part * Participants aged ≥18 years with histologically or cytologically confirmed (based on local assessment and per local guidelines) mPDAC eligible for treatment in the first line setting and not amenable for potentially curative surgery * Presence of at least one measurable lesion assessed by Computerized Tomography (CT) and/or Magnetic Resonance Imaging (MRI) according to RECIST 1.1 * Eastern Cooperative Oncology Group (ECOG) Performance Status 0-1 * Adequate organ function (assessed by central laboratory for eligibility) * Participants must have recovered from treatment-related toxicities of prior anticancer therapies to grade ≤ 1 (CTCAE v 5.0) at time of screening, except alopecia. Main Exclusion Criteria: * Applicable for both Safety run-in and Randomized part * Previous systemic anti-cancer treatment for metastatic PDAC * Pancreatic neuroendocrine (islet) or acinar tumors * Participants with known status of microsatellite instability-high (MSI-H) or mismatch repair-deficient pancreatic cancer (if status is not already available, testing is not required at screening). * Participant has not recovered from a major surgery performed prior to start of study treatment or has had a major surgery within 4 weeks prior to start of study treatment. * Radiation therapy or brain radiotherapy ≤ 4 weeks prior to start of study treatment (palliative radiotherapy to bone lesions allowed \> …