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A case of acute diffuse large B cell lymphoma in an anti-human T-cell leukaemia virus type 1-positive rheumatoid arthritis patient treated with methotrexate, who died.
Modern rheumatology case reports. 2020 July
A 70-year-old woman was hospitalised due to jaundice and fever. She was diagnosed with rheumatoid arthritis (RA) at 54 years of age. Treatment with methotrexate (MTX) was successful, and her RA was in remission. Five weeks before the hospitalisation, she was diagnosed with optic neuritis due to a decline in the visual acuity of the right eye. She was treated with methylprednisolone pulse therapy, followed by prednisolone (PSL), before the hospitalisation, which were not effective. Blood tests showed increased C-reactive protein (CRP) levels, liver injury, and thrombocytopenia. Abdominal echo revealed numerous enlarged lymph nodes in the hepatic portal region. Malignant lymphoma was suspected due to high serum levels of soluble interleukin-2 receptor. None of the treatments were effective, and she died on the fifth hospital day. Diffuse large B cell lymphoma was diagnosed during the autopsy, which showed infiltration of CD20-positive atypical lymphocytes in almost all organs. Since she was taking MTX, she was diagnosed with immunosuppressive drug-associated lymphoproliferative disease (LPD). Anti-human T-cell leukaemia virus type 1 (HTLV-1) antibody was detected in her serum after her death; however, adult T cell leukaemia/lymphoma was not observed. LPD develops during the treatment of RA with disease modifying anti-rheumatic drugs; however, a rapid clinical course leading to death is rarely observed. Previous reports suggest that T cell dysregulation observed in HTLV-1 may contribute towards the development of B cell lymphoma. We have discussed the possible roles of HTLV-1 in LPD development in this case.
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