量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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We have conducted a meta-analysis of studies on the excess relative risk per Gy (ERR) of second cancer before, but the small number of eligible studies restricted quantitative evaluations. To solve this problem, a method to calculate ERR per Gy estimates from another form of estimates was developed, and a meta-analysis was conducted again. We searched the PubMed database, and 26 studies were identified. ERR per Gy estimates were available in 15 studies, and for rest 11 studes, we used the regression model to calculate ERR per Gy estimates from other estimates. The overall ERR per Gy estimate was 0.61 (95% CI: 0.31, 1.2), which was much lower than that of atomic bomb survivors exposed as young children (1.7; 95%CI: 1.1, 2.5). Heterogeneity of the ERR per Gy estimates among studies was suggested, and the reasons were explored. It was suggested that ERR per Gy estimates in the different SMN sites differed greatly, and they also decreased to 0.88 time by one year increase in primary cancer age. The heterogeneity could be explained by the SMN sites and primary cancer age to some extent.
会議概要（会議名, 開催地, 会期, 主催者等）
The Third Asian and Oceanic Congree on Radiation Protection
Meta-Analysis of Second Cancer Risk after Radiotherapy among Childhood Cancer Survivors
