Perioperative Platelet Inhibition With Acetylsalicylic Acid in Patients With Resectable Tumors of the Pancreatic Head

This randomized, controlled clinical trial compares the perioperative treatment with acetylsalicylic acid (aspirin) in patients with cancer of the pancreatic head. The main question it aims to answer is: Do patients treated perioperatively with aspirin develop less metastasis after curative resection of pancreatic head tumors? Participants will be asked to : * take a daily aspirin tablet starting 1-4 weeks before surgery until 6 months after surgery * participate in regular follow-up visits.