Home›OB/GYN & Women's Health› Ionizing radiation exposure is associated with increased breast cancer risk with an ERR/Gy of 0.56
Ionizing radiation exposure is associated with increased breast cancer risk with an ERR/Gy of 0.56Ionizing Radiation Exposure Linked to Higher Breast Cancer Risk
British journal of cancerPublished September 2, 2026Study authors: Chirikova Ekaterina, Ronckers Cecile M, Little Mark P, Quinn Emma, Liu Brittany, Hu Richard, Gillan …PubMed ↗DOI ↗Editorial oversight: Dr. Sofia Müller, MD · Lifespan & Whole-Person Care
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Key Takeaway
Note that ionizing radiation exposure is associated with increased breast cancer risk (ERR/Gy of 0.56).
This meta-analysis synthesized data from 40 studies, providing 44 ERR/Gy estimates from 3522 screened articles, to evaluate the association between ionizing radiation and breast cancer incidence. The primary finding is an increased risk of breast cancer associated with radiation exposure, with a reported ERR/Gy of 0.56 (95% CI: 0.29 to 0.83).
The analysis further identified higher summary ERRs in specific contexts, including high dose-rate exposures, moderate (1-5 Gy) doses, childhood exposures, and for individuals who attained an age over 55. These findings suggest that multiple types of radiation exposure are associated with increased breast cancer risk.
While the meta-analysis provides a quantified association, the study notes that these findings represent an association rather than a direct causal link. No specific limitations or clinical practice implications were reported in the source data. The results provide a quantified basis for understanding radiation-related risks in the context of breast cancer.
How this fits prior evidence
This meta-analysis provides data on radiation-related risks, which complements existing evidence regarding other risk factors. While previous coverage noted that certain nutrients like lutein, beta-carotene, and vitamin D are associated with lower risks of breast cancer, this study quantifies the increased risk associated with ionizing radiation. It also provides a distinct contrast to the findings regarding PFAS compounds, which showed inverse associations with invasive breast cancer risks.
A large review of 40 studies looked at how ionizing radiation affects the risk of developing breast cancer. The researchers analyzed data from thousands of articles to determine how different types of radiation exposure impact health outcomes for women.
The findings show a clear link between radiation exposure and an increased risk of breast cancer. This risk appears higher in specific situations, such as when a person is exposed to high dose rates or moderate doses between 1 and 5 Gy. The study also noted higher risks for those who were exposed to radiation during childhood or those who were over age 55 at the time of exposure.
Because this is a meta-analysis of many different studies, the results show a statistical association rather than a direct cause. The data is complex and varies based on the amount of radiation and the age of the person. You should speak with a healthcare professional to understand how these findings apply to your specific medical history.
What this means for you:
Research shows a link between ionizing radiation and increased breast cancer risk, especially in high-dose cases.
Common questions
Does radiation exposure increase the risk of breast cancer?
The study found an association between ionizing radiation and an increased risk of breast cancer. The data showed an estimated risk increase of 0.56 per Gray (Gy). This link was observed across various types of radiation exposure, but it is an association rather than a proven direct cause.
Are there specific types of radiation exposure that are riskier?
The study found higher risk levels in several specific scenarios. These include high dose-rate exposures, moderate doses between 1 and 5 Gy, and exposure during childhood. There was also a higher risk noted for individuals who were over the age of 55 when exposed.
Who is most affected by these radiation risks?
The study specifically looked at women exposed to ionizing radiation. It highlighted that the risk was higher for those exposed during childhood or those who were over age 55. You should talk to your doctor to discuss how these findings relate to your personal health.
BACKGROUND: While breast cancer risk from high-dose ionising radiation is known, uncertainties remain about risks at lower doses and risk-modifying factors. We conducted a systematic review and meta-analysis of publications on radiation-associated risk of breast cancer in women.
METHODS: We included studies published in 2005-2022 that assessed breast cancer incidence or mortality in women exposed to ionising radiation. Risk of bias was evaluated. Random-effects meta-analyses estimated excess relative risks per gray (ERR/Gy).
RESULTS: Of the 3522 articles screened, 106 met the inclusion criteria; 40 studies provided 44 ERR/Gy estimates. Overall, radiation exposure was associated with increased breast cancer risk (ERR/Gy = 0.56, 95% CI: 0.29-0.83). Between-study heterogeneity (I = 95%) was substantially reduced in subgroup analyses, reaching 5% in low-dose-rate studies. Higher summary ERRs were observed for high dose-rate exposures, moderate (1-5 Gy) doses, childhood exposures, and attained age over 55. Lower but significantly increased risks were estimated for other subgroups and exposure scenarios.
CONCLUSIONS: Radiation exposure was associated with a significantly increased risk of breast cancer among women, particularly following high dose-rates, moderate doses, childhood exposures, and older attained age. PROSPERO registration: CRD42021260610.
