Cytomegalovirus infection as a cause of cytopenia after chemotherapy for hematological malignancies.

OBJECTIVE Unlike hematopoietic stem cell transplantation, there is very little information on cytomegalovirus (CMV) related cytopenias occurring in patients having acute lymphoblastic leukemia (ALL) or Non Hodgkin’s lymphoma (NHL) receiving standard dose chemotherapy (SDCT). We studied the role of CMV infection in cytopenias after SDCT for childhood ALL or NHL. DESIGN Retrospective study. SETTING Pediatric Oncology Unit. METHODS Between January 2007 and March 2010, we screened all children having ALL/NHL having prolonged cytopenia (ANC<1,000/cmm and/or platelets <1,00,000/cmm; >10 days beyond date for next chemotherapy; not explainable on basis of previously administered chemotherapy) for CMV infection. Testing for CMV infection was done by pp65 antigen assay, qualitative or quantitative RT-PCR. CMV positive episodes were analyzed for relationship to previous chemotherapy, clinical features and response to treatment. RESULTS As defined, 24 episodes of cytopenia were identified. CMV infection was detected in 13/24 (54%) episodes in 9 patients. Duration of cytopenia in patients having CMV infection: 14-126 days (median 28 d). Neutropenia or thrombocytopenia were seen in 11/13 and 13/13 episodes, respectively. Fever (2-20 d) and loose motions (3-60 d) in 11/13 and 9/13 episodes, respectively. Eye examination records were available in 5 children; 3 had simultaneous or delayed chorioretinitis. Gancyclovir was used in all but 1 CMV-positive episode. In treated cases, counts recovered after a median of 8 days (3-56 d). CONCLUSION Following chemotherapy for ALL/NHL, cytopenia that is prolonged or not explainable on the basis of chemotherapy toxicity should be evaluated for CMV infection.