Abstract
Human herpesvirus-6 (HHV-6) is a major cause of limbic encephalitis with a dismal prognosis after allogeneic hematopoietic SCT (HSCT). A prospective, multicenter study was conducted to assess the safety and efficacy of preemptive therapy with foscarnet sodium (PFA) for the prevention of HHV-6 encephalitis. Plasma HHV-6 DNA was measured thrice weekly from day 7 until day 36 after umbilical cord blood transplantation (UCBT) or HSCT from HLA-haploidentical relatives. PFA, 90 mg/kg/day, was started when HHV-6 DNA exceeded 5 × 102 copies/mL. Mild and transient adverse events were associated with PFA in 7 of 8 patients. Twelve of 15 UCBT recipients became positive for HHV-6 DNAemia, defined by greater than 1 × 102 copies/mL of HHV-6 DNA in plasma. The virus exceeded 5 × 102 copies/mL in seven patients, whereas none of the five HLA-haploidentical HSCT recipients became positive. One patient developed mild limbic encephalitis just after initial PFA administration. Preemptive PFA therapy is safe, but as HHV-6 DNAemia can abruptly develop before neutrophil engraftment in UCBT recipients, prophylactic PFA administration from day 7 or earlier after UCBT may be needed.
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Acknowledgements
We thank Ms Rie Ohumi (Cellular Transplantation Biology, Division of Cancer Medicine, Kanazawa University Graduate School of Medical Science, and Kiyotaka Miyamoto, SRL Inc.) for excellent technical assistance. We also thank the following doctors who contributed to this study: Shigeru Shimadoi of Kanazawa University Hospital; Shuichi Miyawaki, Toru Sakura and Satoru Takada of Saiseikai Maebashi Hospital; Toshiro Kurokawa and Jun Ozaki of Toyama Prefectural Central Hospital; and Go Aoki of Ishikawa Prefectural Central Hospital.
Funding: This work was supported by a Grant-in-Aid for Cancer Research (19–1) from the Ministry of Health, Labour and Welfare of Japan.
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Ishiyama, K., Katagiri, T., Hoshino, T. et al. Preemptive therapy of human herpesvirus-6 encephalitis with foscarnet sodium for high-risk patients after hematopoietic SCT. Bone Marrow Transplant 46, 863–869 (2011). https://doi.org/10.1038/bmt.2010.201
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DOI: https://doi.org/10.1038/bmt.2010.201
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