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We evaluated the relationship between bone marrow radiation doses and clinical characteristics and survival of 79 CLL cases diagnosed during 1986\u20132006 in a cohort of 110\u2009645 male workers who participated in the cleanup work of the Chornobyl nuclear accident in Ukraine in 1986. All diagnoses were confirmed by an independent International Hematology Panel. Patients were followed up to the date of death or end of follow\u2010up on 31 October 2010. The median age at diagnosis was 57\u2009years. Median bone marrow dose was 22.6\u2009milligray (mGy) and was not associated with time between exposure and clinical diagnosis of CLL (latent period), age, peripheral blood lymphocyte count or clinical stage of disease in univariate and multivariate analyses. Latent period was significantly shorter among those older at first exposure, smokers and those with higher frequency of visits to the doctor prior to diagnosis. A significant increase in the risk of death with increasing radiation dose was observed (<jats:italic>p<\/jats:italic>\u2009=\u20090.03, hazard ratio\u2009=\u20092.38, 95% confidence interval: 1.11,5.08 comparing those with doses \u226522\u2009mGy to doses &lt;22\u2009mGy). After adjustment for radiation dose, survival of CLL cases was significantly shorter among those with younger age at first exposure, higher peripheral blood lymphocyte count, more advanced clinical stage of disease and older age at diagnosis (all <jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). This is the first study to examine association between bone marrow radiation doses from the Chornobyl accident and clinical manifestations of the CLL in Chornobyl cleanup workers. The current study provides new evidence on the association of radiation dose and younger age at first radiation exposure at Chornobyl with shorter survival after diagnosis. Future studies are necessary with more cases in order to improve the statistical power of these analyses and to determine their significance. Copyright \u00a9 2016 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/hon.2278","type":"journal-article","created":{"date-parts":[[2016,1,25]],"date-time":"2016-01-25T11:16:57Z","timestamp":1453720617000},"page":"215-224","source":"Crossref","is-referenced-by-count":8,"title":["Clinical characteristics of chronic lymphocytic leukemia occurring in chornobyl cleanup workers"],"prefix":"10.1002","volume":"35","author":[{"given":"Stuart C.","family":"Finch","sequence":"first","affiliation":[{"name":"Rutgers\u2010Robert Wood Johnson Medical School  New Brunswick NJ USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Irina","family":"Dyagil","sequence":"additional","affiliation":[{"name":"National Research Center for Radiation Medicine  Kyiv Ukraine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert F.","family":"Reiss","sequence":"additional","affiliation":[{"name":"Department of Pathology and Cell Biology, and Department of Medicine College of 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