Below is an instruction from Human. Write a response.
    ### Instruction:
    What to do for Zollinger-Ellison Syndrome ?
    ### Response:
    - Zollinger-Ellison syndrome is a rare disorder that occurs when one or more tumors form in the pancreas and duodenum.  - Experts do not know the exact cause of Zollinger-Ellison syndrome.  - About 25 to 30 percent of gastrinomas are caused by an inherited genetic disorder called multiple endocrine neoplasia type 1 (MEN1).
    