Abstract
Introduction: Letermovir (LMV) is a new, cytomegalovirus (CMV)-specific, antiviral drug, approved in 2018 for CMV prophylaxis in patients after allogeneic hematopoietic transplantation. The introduction of letermovir prophylaxis has changed the management of CMV infection: it has reduced the incidence of CMV infections and CMV-related complications, and also improved the overall survival in CMV seropositive patients. However, until recently, due to its high treatment cost, prophylaxis with letermovir has not beeen a standard of care in Poland. Material and methods: To confirm the effectiveness and safety of letermovir prophylaxis, we collected real-life data from eight Polish transplant centers, in which a total of 53 patients were treated with letermovir, including off-label use. Results: LMV is characterized by low toxicity and good tolerability. There were no reports of special adverse events caused by LMV. Conclusions: Our experiences confirm the effectiveness and safety of letermovir prophylaxis, and suggest that this prophylaxis should be started as soon as possible after the infusion of stem cells, preferably no later than day 14. Moreover, our findings indicate that some patients could benefit from extended letermovir prophylaxis beyond 100 days after transplant.
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