What is the treatment for multiple endocrine neoplasia?

Surgery usually. It depends what type (men1, 2a or 2b) you have. While hormone manipulation for parathyroid, calcium, and glucose can manage some symptoms, and hypertension can be managed with medication -- all of these "tumors" need to be removed to completely manage the disease. Generally, the pancreatic, adrenal and thyroid tumors are more troublesome than the parathyroid or pituitary.