Second malignancies in thyroid cancer patients: a population-based survey of 3658 cases from Norway
1992
In a population-based survey of 3658 thyroid cancer patients diagnosed in Norway during 1955–85, a total of 200 cases of second malignancies were observed (30 414 person-years, mean follow-up 8.4 years). Male patients had a significantly increased incidence of urogenital cancer [standardised incidence ratio (SIR) = 1.96, 95% confidence interval (CI) 1.4–2.7], including cancer of the testis (SIR = 11.8, 95% CI 3.2–30.1) and urinary bladder (SIR = 3.0, 95% CI 1.5–5.2). The occurrence of malignant melanoma was also increased among males (SIR = 4.2, 95% CI 1.4–9.7). This apparent association with urogenital cancers among males at the present time cannot be explained, although increased surveillance as well as specific aetiological factors should be considered.
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