RecruitingPost-authorization Safety Study of Allogeneic Hematopoietic Stem Cell Transplantation in Patients Treated With MogamulizumabThis is a non-interventional cohort study evaluating non-relapse mortality and toxicities in patients with CTCL or ATLL treated with mogamulizumab pre- or post- alloHCT for patients transplanted beginning January 1, 2012 until accrual is complete.