The trial will have the following parts:~Part A: Dose escalation, first-in-human, single-agent phase 1 trial of SOT102 in advanced/metastatic gastric/GEJ or pancreatic cancer patients with unmet medical need (CLDN18.2 agnostic)~Part B gastric cohort: Phase 1b dose escalation combination trial of SOT102 in combination with mFOLFOX6 and nivolumab as SoC regimen for first-line treatment of patients with advanced/metastatic gastric/GEJ cancer (CLDN18.2 agnostic)~Part B pancreatic cohort: Phase 1b dose escalation combination trial of SOT102 in combination with nab-paclitaxel/gemcitabine as SoC regimen for first-line treatment of patients with advanced/metastatic pancreatic cancer (CLDN18.2 agnostic)~Once an RP2D in the respective phase 1 evaluation (Part A and Part B) has been identified expansion cohorts for gastric/GEJ and pancreatic cancer (Part C and Part D) are planned:~Part C gastric cohort: Single-agent SOT102 expansion at RP2D identified in Part A in gastric/GEJ cancer after two or more prior systemic therapies (third+ line) for locally advanced or metastatic disease (CLDN18.2 positive)~Part C pancreatic cohort: Single-agent SOT102 expansion at RP2D identified in Part A in pancreatic cancer after one or more prior systemic therapies (second+ line) for locally advanced or metastatic disease (CLDN18.2 positive)~Part D gastric cohort: SOT102 in combination with mFOLFOX6 and nivolumab expansion at RP2D identified in Part B for first-line treatment in gastric/GEJ cancer (CLDN18.2 positive)~Part D pancreatic cohort: SOT102 in combination with nab- paclitaxel/gemcitabine for first-line treatment expansion at RP2D identified in Part B in pancreatic cancer (CLDN18.2 positive)
This trial will assess the MTD and RP2D of SOT102 administered as monotherapy (Part A) and in combination with first-line SoC treatment (mFOLFOX6 with nivolumab and nab-paclitaxel/ gemcitabine; Part B) and efficacy of SOT102 administered as monotherapy (Part C) and in combination with first-line SoC treatment (Part D) in patients with advanced inoperable or metastatic gastric/GEJ adenocarcinoma or inoperable or metastatic pancreatic adenocarcinoma.