This study examined the risk of testicular cancer in those men who used cell phones. It included men with testicular cancer who were identified in the Swedish Cancer Registry in the years 1993-1997. After exclusions for death and other reasons, 981 of the original 1061 cases were included. Each case was matched to a control in the same 5-year age group. Questionnaires were sent to all cases and controls, and after up to 2 reminders 889 cases (91%) and 870 controls (89%) responded. Amongst the cases, 542 had seminoma and 346 non-seminoma. (This adds up to 888, not 889). The questionnaire included inquiries about use of cell and cordless phones, first year of use, type of phone (analog or digital), mean minutes of daily use, use in a car with external antenna or a hands-free phone, and location of the phone during standby.
the Odds Ratio (OR) for analog phones was 1.2 (95% CI = 0.9-1.6),
digital phones OR 1.3 (CI = 0.9-1.8), and cordless phones OR 1.1
(CI = 0.8-1.5). Similar results were obtained for non-seminoma.
There was no dose-response effect and OR did not increase with
latency time. No association was found with place of keeping the
cell phone during standby, such as the trousers pocket.