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Cancer risks among studies of medical diagnostic radiation exposure in early life without quantitative estimates of dose

子宫内 医学 绝对风险降低 癌症 电离辐射 优势比 儿童癌症 辐射暴露 风险因素 怀孕 儿科 内科学 人口 核医学 环境卫生 胎儿 辐照 核物理学 生物 遗传学 物理
作者
Mark P. Little,Richard Wakeford,Simon Bouffler,Kossi Abalo,Michael Hauptmann,Nobuyuki Hamada,G M Kendall
出处
期刊:Science of The Total Environment [Elsevier]
卷期号:832: 154723-154723 被引量:23
标识
DOI:10.1016/j.scitotenv.2022.154723
摘要

There is accumulating evidence of excess risk of cancer in various populations exposed at acute doses below several tens of mSv or doses received over a protracted period. There is also evidence that relative risks are generally higher after radiation exposures in utero or in childhood.We reviewed and summarised evidence from 89 studies of cancer following medical diagnostic exposure in utero or in childhood, in which no direct estimates of radiation dose are available. In all of the populations studied exposure was to sparsely ionizing radiation (X-rays). Several of the early studies of in utero exposure exhibit modest but statistically significant excess risks of several types of childhood cancer. There is a highly significant (p < 0.0005) negative trend of odds ratio with calendar period of study, so that more recent studies tend to exhibit reduced excess risk. There is no significant inter-study heterogeneity (p > 0.3). In relation to postnatal exposure there are significant excess risks of leukaemia, brain and solid cancers, with indications of variations in risk by cancer type (p = 0.07) and type of exposure (p = 0.02), with fluoroscopy and computed tomography scans associated with the highest excess risk. However, there is highly significant inter-study heterogeneity (p < 0.01) for all cancer endpoints and all but one type of exposure, although no significant risk trend with calendar period of study.Overall, this large body of data relating to medical diagnostic radiation exposure in utero provides support for an associated excess risk of childhood cancer. However, the pronounced heterogeneity in studies of postnatal diagnostic exposure, the implied uncertainty as to the meaning of summary measures, and the distinct possibilities of bias, substantially reduce the strength of the evidence from the associations we observe between radiation imaging in childhood and the subsequent risk of cancer being causally related to radiation exposure.
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