Supplementary Material for: Reduced CC chemokine receptor 4 expression in tumor cells after lenalidomide treatment for adult T-cell leukemia/lymphoma: A case report

CC chemokine receptor 4 (CCR4), which is involved in leukocyte migration, is expressed in most tumor cells in patients with adult T-cell leukemia/lymphoma (ATLL). Here we report the case of a 78-year-old man diagnosed with lymphoma-type ATLL expressing CCR4. The patient was administered two cycles of lenalidomide but died because of sepsis 5 months after the initial diagnosis. Autopsy revealed ATLL cells at several sites. Immunohistochemical analysis revealed that these ATLL cells had reduced CCR4 expression. The present case suggests that treatment should be carefully determined in ATLL with reference to a history of lenalidomide use and CCR4 expression.