- At the end of Month 9, subjects who maintain/achieve CR with no evidence of MRD will continue to receive AZT (± IFN-alfa) for 3 more months, to Month 12. Those with MRD (without clinical evidence of disease progression or clinical evidence of ATLL) may also continue to receive AZT (± IFN-alfa) for 3 more months to Month 12 OR be removed from the study at the discretion of the Investigator.