For safety reasons, the FDA requires that patients who receive infusions of stem cells treated with a gene transfer procedure must have long-term follow-up for at least 15 years after receiving the gene transfer. After you have received an infusion of the T cells you will be asked to sign a separate consent form for a long-term follow-up named "Long-Term Follow-Up Study of Recipients of Gene Transfer Research Protocols" (Protocol 2006-0676).