Olivier Busch focuses his research on the surgery of the upper gatsrointestinal tract, oesophagus and stomach, and Hepatopancreatobiliary surgery (HPB surgery), that covers liver, pancreas and bile duct surgery. He is particularly interested in the oncological aspects of tumors of these organs. Busch expects that increasingly more tumors that are operated on will be treated in combination of chemo- and radiotherapy. Also non-malignant disorders such as pancreatitis and motility disorders of the oesophagus attract his attention. Moreover, functional aspects of this surgery hold a prominent place.