• V Reddy, Y Hao, J Lipton, J Meharchand, M Minden, T Mazzulli, C Chan, and H A Messner.
• Department of Medicine, The Princess Margaret Hospital, Toronto, Canada.
• J. Clin. Virol. 1999 Aug 1;13(3):149-59.

BackgroundPatients undergoing allogeneic bone marrow transplant (BMT) are considered to be at increased risk of cytomegalovirus (CMV) disease if they and/or their donor are CMV seropositive pre-transplant. Although several pre-emptive strategies have been shown to be effective in preventing early CMV disease, the ability of pre-emptive strategies using prolonged ganciclovir therapy to reduce the incidence of late-onset CMV infection, disease and mortality has not been fully evaluated.ObjectiveTo assess the efficacy of 18 weeks of pre-emptive ganciclovir therapy in preventing late-onset (> 100 days post-transplant) CMV disease when administered to asymptomatic BMT patients found to have CMV in bronchoalveolar lavage (BAL) fluid obtained during a surveillance bronchoscopy approximately 35 days post-transplant. To determine whether or not survival of BMT recipients is influenced by pre-transplant donor and recipient CMV serostatus in the context of this pre-emptive ganciclovir strategy.Study DesignConsecutive patients undergoing allogeneic BMT were assessed for their risk of developing CMV disease based on their pre-transplant CMV serostatus and that of their donor. Patients who were CMV seropositive and/or received marrow from a CMV seropositive donor underwent a surveillance bronchoscopy and BAL approximately 35 days post-transplant. Patients with positive BAL fluid for CMV received pre-emptive ganciclovir therapy for 18 weeks at decreasing dose levels. Patients considered to be at low risk for the development of CMV disease (donor and recipient CMV seronegative) were followed without intervention.ResultsOf 98 consecutive patients, 55 were considered to be at risk for CMV disease and underwent a surveillance bronchoscopy. Sixteen (29%) patients had a positive BAL fluid for CMV and were started on pre-emptive ganciclovir therapy. Two patients progressed and died with CMV-related pneumonia. One additional patient developed CMV-related enteritis on day 42 post-transplant and recovered with continuing ganciclovir treatment. Of the 39 patients with a negative BAL fluid for CMV, one developed a fatal CMV pneumonia 150 days post-transplant and two additional patients developed gastrointestinal CMV disease 28 and 57 days post-BMT, respectively. None of the patients in the low risk group developed CMV disease.ConclusionsThe strategy utilizing a surveillance bronchoscopy for CMV and initiating prolonged (18 weeks) pre-emptive ganciclovir therapy for patients with a positive BAL fluid for CMV resulted in a low incidence of CMV-related post-transplant complications. After a minimum follow-up of 16 months, late CMV reactivations (occurring > 100 days post-transplant) were not observed in the group of individuals pre-emptively treated with ganciclovir. This observation suggests that prolonged therapy with a reduced dose of ganciclovir may be important in the prevention of CMV reactivation. The CMV serostatus of donors and recipients prior to BMT did not correlate with survival.

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