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  • Title: Prospective study of transfusion history and thyroid cancer incidence among females in Japan.
    Author: Fujino Y, Tamakoshi A, Hoshiyama Y, Mikami H, Okamoto N, Ohno Y, Yoshimura T.
    Journal: Int J Cancer; 2004 Nov 20; 112(4):722-5. PubMed ID: 15382057.
    Abstract:
    A link between hepatitis C virus (HCV) infection and thyroid cancer was recently reported in a series of case-control studies in southern Italy. A prospective study could reinforce these findings. However, cohort studies that began before 1990 rarely assessed serological HCV infection. In addition, thyroid cancer is rare and generally has a good prognosis. Therefore, incidence outcome data are required, rather than mortality data, to evaluate the risk of thyroid cancer. Blood transfusion history might be a possible substitute measure to evaluate the cancer risks associated with HCV infection because blood transfusions were the major HCV transmission route in Japan until 1992. The purpose of our study was therefore to examine the association between transfusion history and thyroid cancer. A baseline survey of members of the JACC Study was conducted from 1988 until 1990, which involved 110,792 participants from 45 areas throughout Japan. Data were collected from a total of 37,983 women with no history of cancer at the baseline (337,906 person-years) and 79 cases of thyroid cancer were identified among this group. A history of blood transfusion marginally increased the risk of thyroid cancer [risk ratio (RR)=1.77, 95% confidence interval (CI)=0.95-3.30], and a history of transfusion and/or liver disease significantly increased the thyroid cancer risk (RR=1.84, 95% CI=1.07-3.16). These results indirectly support an association between HCV and thyroid cancer. In addition, our data reveal an association between blood transfusion and thyroid cancer, which might be facilitated by transfusion-associated immunomodulation.
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