 - If we are successful in growing the iNKT cells to large enough numbers, they will be divided into 3 equal doses. Participants will receive one dose of these cells by intravenous infusion every 2 weeks or days 1, 15 and 29. A blood sample will be taken immediately before each infusion, and at 1 and 4 hours after each infusion. Participants will be asked to return for blood samples on day 2, 3, 4 and 8 after infusion. 