Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) VIPoma ?
    ### Response:
    VIPoma is a rare cancer that develops within the pancreas. This tumor causes pancreatic cells to produce high levels of a hormone called vasoactive intestinal peptide (VIP). The signs and symptoms of a VIPoma include abdominal pain, flushing or redness of the face, nausea, watery diarrhea, weight loss, dehydration, and low blood potassium (hypokalemia).
    