Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Multiple Endocrine Neoplasia Type 1 ?
    ### Response:
    MEN1 is an inherited disorder that causes tumors in the endocrine glands and the duodenum, the first part of the small intestine. MEN1 is sometimes called multiple endocrine adenomatosis or Wermer's syndrome, after one of the first doctors to recognize it. MEN1 is rare, occurring in about one in 30,000 people.
    