 Participants will come to the clinic to have a complete physical and neurological exam and blood tests less than 2 tablespoons of blood before each course. Blood tests will be repeated once a week for the first 2 courses of treatment and then on Days 14 and 28 of each later course. A MRI scan will be done before the odd-numbered 3, 5, 7, etc. courses of treatment or at any time clinically indicated. 