Only one proven risk factor has been found so far. Multiple endocrine neoplasia, type 1 (MEN1) is a hereditary condition that has a very high risk of developing tumors of three glands – pituitary, parathyroid and pancreas. It is inherited by half of the children of each affected parent. If the MEN1 syndrome affects your family, you should discuss biochemical or genetic testing for this condition with your doctor.