Question: What are the treatments for Lambert-Eaton Myasthenic Syndrome ?
Answer: There is no cure for LEMS. Treatment is directed at decreasing the autoimmune response (through the use of steroids, plasmapheresis, or high-dose intravenous immunoglobulin) or improving the transmission of the disrupted electrical impulses by giving drugs such as di-amino pyridine or pyridostigmine bromide (Mestinon). For patients with small cell lung cancer, treatment of the cancer is the first priority.
Source: NINDS

Question: What is the outlook for Lambert-Eaton Myasthenic Syndrome ?
Answer: The prognosis for individuals with LEMS varies. Those with LEMS not associated with malignancy have a benign overall prognosis. Generally the presence of cancer determines the prognosis.
Source: NINDS