although there is no direct link between exposure to radio waves and the genotoxic mechanisms that lead to cancer , studies to address the association between use of cellular telephones and cancer risk have been performed . case - control study of uveal melanoma patients in germany using three groups of control subjects : population - based , siblings of patients , and ophthalmology control subjects . no association between cellular telephone use and uveal melanoma risk was observed . using cellular telephones subjects who agreed to participate in the study were more likely to regularly use cellular telephones than subjects who did not agree to participate . although there is no direct link between exposure to radio waves and the genotoxic mechanisms that lead to cancer , studies to address the association between use of cellular telephones and cancer risk have been performed . case - control study of uveal melanoma patients in germany using three groups of control subjects : population - based , siblings of patients , and ophthalmology control subjects . subjects who agreed to participate in the study were more likely to regularly use cellular telephones than subjects who did not agree to participate . german science foundation ( dfg ) ( grants kfo 109/1 - 1 and 444 usa 111/7/06 to as ) ; federal radiation protection agency ( bfs ) ( grant m 8811 to as ) .
we recently reported an increased risk of uveal melanoma among mobile phone users . here , we present the results of a case  control study that assessed the association between mobile phone use and risk of uveal melanoma . 
 we recruited 459 uveal melanoma case patients at the university of duisburg - essen and matched 455 case patients with 827 population control subjects , 133 with 180 ophthalmologist control subjects , and 187 with 187 sibling control subjects . 
 we used a questionnaire to assess mobile phone use and estimated odds ratios ( ors ) and 95% confidence intervals ( 95% cis ) of risk for uveal melanoma using conditional logistic regression . 
 risk of uveal melanoma was not associated with regular mobile phone use ( or = 0.7 , 95% ci = 0.5 to 1.0 vs population control subjects ; or = 1.1 , 95% ci = 0.6 to 2.3 vs ophthalmologist control subjects ; and or = 1.2 , 95% ci = 0.5 to 2.6 vs sibling control subjects ) , and we observed no trend for cumulative measures of exposure . 
 we did not corroborate our previous results that showed an increased risk of uveal melanoma among regular mobile phone users .