To understand the safety and efficacy of Revlimid® Capsules 2.5 mg and 5 mg (hereinafter referred to as Revlimid) under actual conditions of use in patients with relapsed or refractory adult T-cell leukemia lymphoma (hereinafter referred to as relapsed or refractory Adult T-cell Leukemia Lymphoma (ATLL)).

1. Planned registration period 3 years
2. Planned surveillance period 4 years and 6 months after a month after the approval for partial changes in the approved items is granted for relapsed or refractory ATLL

Inclusion Criteria:

- Relapsed or Refractory Adult T-cell Leukemia Lymphoma

Exclusion Criteria:

• N/A

Among patients with relapsed or refractory adult T-cell leukemia lymphoma (hereinafter referred to as "Adult T-cell Leukemia Lymphoma (ATLL)") who are treated with Revlimid Capsules (hereinafter referred to as "Revlimid", used by both 2.5 mg and 5 mg capsules).