alexa Epstein-Barr virus-associated hemophagocytic lymphohistiocytosis in Los Angeles County.

Oncology & Cancer Case Reports

Author(s): Kelesidis T, Humphries R, Terashita D, Eshaghian S, Territo MC,

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Abstract Data on Epstein-Barr virus-related hemophagocytic lymphohistiocytosis (EBV-HLH) in adults in the United States remain very limited. A cluster of four cases of EBV-HLH was observed in a 4-month period at a tertiary center in Los Angeles County (LA County) and the clinical and molecular characteristics identified in these cases are being described. EBV typing, immunophenotypic and molecular genetic studies were performed. Diagnostic criteria that may be used to identify EBV as a cause of HLH in adults are also being suggested. Finally, the crude incidence rate for HLH in LA County was determined and was compared to the worldwide crude incidence rate for HLH. The cases each occurred in young male adult residents of California and were associated with evidence of EBV reactivation and ferritin levels of >20,000 µg/L. A higher rate of cases of EBV-HLH in 2010 was found at UCLA Medical Center than for 2007-2009 (4.9/10,000 hospital discharges vs. 0.14/10,000 hospital discharges, respectively; P = 0.0017). The cases were associated with EBV type 1, and the insertion of the codon CTC (leucine) was found in numerous of the EBNA-2 gene sequences. The annual incidence of secondary, non-familial HLH was estimated to be 0.9 cases per million persons >15 years of age in LA County. Although EBV-HLH is a rare disease, the incidence in adults in Western countries may be underestimated. Copyright © 2012 Wiley Periodicals, Inc. This article was published in J Med Virol and referenced in Oncology & Cancer Case Reports

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