Some people with pancreatic ductal cancer (PDAC) have a protein called Claudin 18.2 (CLDN18.2) in their tumor. ASP2138 is thought to work by binding to CLDN18.2 and a protein on a type of immune cell called a T-cell. The T-cell "tells" the immune system to attack the tumor. This study is for people with resectable PDAC. Resectable means that the tumor can be removed by surgery.
In this study, adults with resectable PDAC will receive an ASP2138 injection just below the skin (subcutaneous) 2 weeks before surgery. After surgery, they will be given standard chemotherapy treatments chosen by their study doctor. These include mFOLFIRINOX, gemcitabine with nab-paclitaxel, or gemcitabine with capecitabine.
People will receive chemotherapy treatment for up to 6 months, or until their cancer gets worse, they cannot tolerate the chemotherapy, or they or their study doctor thinks they should stop chemotherapy. People will have a final clinic visit about a month after finishing chemotherapy for health checks.
Participant has histologically confirmed localized pancreatic adenocarcinoma which is deemed upfront resectable based on institutional multi-disciplinary review. Participant with localized pancreatic adenocarcinoma cannot have received any prior therapy.
Participant has confirmation of positive claudin (CLDN)18.2 test result by local laboratory prior to first dose of study intervention (ASP2138 dosing may be allowed after discussion with the medical monitor, if results are pending or a biopsy for CLDN18.2 testing is not clinically appropriate). Site should contact the sponsor to assess potential eligibility based on a local test result.
Participant has an available pretreatment tumor sample, if clinically appropriate and meets requirements.
Participant is able to undergo surgery and treatment with adjuvant chemotherapy per institutional standard of care.
Participant has had within 6 months prior to first dose of study intervention any of the following: unstable angina, myocardial infarction, ventricular arrhythmia requiring intervention or hospitalization for heart failure.
Participant has active infection requiring systemic therapy that has not completely resolved within 7 days prior to the start of study intervention.
Participant has active autoimmune disease that has required systemic immunosuppressive treatment within the past 1 month prior to the start of study intervention.
Participant has uncontrolled serious psychiatric illness or social situations that would preclude study compliance.