In this Phase 2 protocol, 6 subjects will be staggered for infusion by at least 2 weeks. The first group of 3 subjects will receive 4 infusions (4-dose cohort). If no dose limiting toxicities (DLT) are observed, the second group of 3 subjects, (i.e. subjects 4, 5 and 6) will continue with 8 infusions (8-dose cohort). Safety visits are scheduled 1 week after infusion and monthly for the first 6 months and at 9 months following the last infusion.