Abstract
AIDS-related lymphoma has a decreased response rate and poorer prognosis to standard chemotherapy when compared with lymphoma in the non-HIV population. In addition to the known HIV-related and lymphoma-related poor prognostic factors, this review discusses another factor, MDR-1 expression and its impact on response to therapy in patients with AIDS-related lymphoma. There is an increased incidence of de-novo MDR-1 expression in AIDS-related lymphoma compared with lymphoma in the non-HIV settings. MDR-1 expression in AIDS-related lymphoma is associated with poor response to conventional combination chemotherapy. Liposomal encapsulation of doxorubicin when substituted for doxorubicin in the CHOP regimen (cyclophosphamide, doxorubicin, vincristine, prednisone) seems to overcome P-glycoprotein-mediated drug resistance in AIDS-related lymphoma. The overexpression of MDR-1 gene product P-glycoprotein is an adverse prognostic factor in AIDS-related lymphoma. Treatment with liposomal encapsulated doxorubicin seems to overcome the P-glycoprotein-related drug resistance. This and other strategies to modulate MDR-1 should be further explored in order to improve success rates in the treatment of AIDS-related lymphoma.
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