Two positives - one Prostate Cancer, one Healthy Control. Can people please stop saying there's no XMRV in Europe..... J Clin Virol. 2008 Nov;43(3):277-83. Epub 2008 Sep 27. Prevalence of human gammaretrovirus XMRV in sporadic prostate cancer. Fischer N, Hellwinkel O, Schulz C, Chun FK, Huland H, Aepfelbacher M, Schlomm T. Institute for Medical Microbiology and Virology, University Medical Center Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany. email@example.com BACKGROUND: We previously identified a novel exogenous gammaretrovirus (xenotropic murine leukemia virus-related gammaretrovirus (XMRV)) using a pan-viral microarray. XMRV is the first MLV-related virus found in human infection. Forty percent (8/20) of familial prostate cancer patients homozygous for a mutation in RNase L (R462Q) were positive for XMRV, while the virus was rarely (1/66) detected in familial prostate cancer patients heterozygous for R462Q or carrying the wild type allele. OBJECTIVES: To determine the presence of XMRV in non-familial prostate cancer samples. STUDY DESIGN: RNA from prostate tissue was analyzed for XMRV using nested RT-PCR. In all samples, RNase L (R462Q) genotyping was performed using an allele-specific PCR. RESULTS: XMRV-specific sequences were detected in one of 105 tissue samples from non-familial prostate cancer patients and from one of 70 tissue samples from men without prostate cancer. The two XMRV-positive patients were wild type or heterozygous for the R462Q mutation and thus carried at least one fully functional RNase L allele. CONCLUSIONS: XMRV was rarely detected in non-familial prostate cancer samples from Northern European patients. The homozygous mutation R462Q (QQ) was significantly underrepresented (<6%) in this cohort when compared to other studies (11-17%).