Med Oncol.2012 Jun;29(2):1223-6. doi: 10.1007/s12032-011-9955-3. Epub 2011 Jul 31.
Loss of CD20 antigen expression after rituximab therapy of CD20 positiveB celllymphoma (diffuse large B cell extranodal marginal zone lymphomacombination): a case report and review of the literature.
Rituximab (the chimeric anti-CD20 antibody) is widely used in the treatment of CD20 positive non-Hodgkin's lymphoma (NHL). The response rate at relapse after repeated use in prior CD20positive responders is lower than 50%. Several mechanisms can be responsible for rituximab resistance. CD20negative relapses which transformed from CD20 positive aggressive and indolent forms of lymphoma can be the one of the reason of secondary resistance to rituximab. The authors report a case with combination of aggressive and indolent form of lymphoma who relapsed after 7 months from the last dose of rituximab therapy. CD20 transformed negative from positive in her relapsed disease. Patients with CD20 positive B cell NHL must rebiopsy after first line rituximab therapy if their disease relapsed or progressed.
Med Oncol.2012 Jun;29(2):1223-6. doi: 10.1007/s12032-011-9955-3. Epub 2011 Jul 31.
Loss of CD20 antigen expression after rituximab therapy of CD20 positiveB celllymphoma (diffuse large B cell extranodal marginal zone lymphomacombination): a case report and review of the literature.
Rituximab (the chimeric anti-CD20 antibody) is widely used in the treatment of CD20 positive non-Hodgkin's lymphoma (NHL). The response rate at relapse after repeated use in prior CD20positive responders is lower than 50%. Several mechanisms can be responsible for rituximab resistance. CD20negative relapses which transformed from CD20 positive aggressive and indolent forms of lymphoma can be the one of the reason of secondary resistance to rituximab. The authors report a case with combination of aggressive and indolent form of lymphoma who relapsed after 7 months from the last dose of rituximab therapy. CD20 transformed negative from positive in her relapsed disease. Patients with CD20 positive B cell NHL must rebiopsy after first line rituximab therapy if their disease relapsed or progressed.