Higher Residential Radon Exposure tied to Ovarian Cancer Risk: JAMA
An analysis from the Women’s Health Initiative has found that high levels of residential radon exposure were associated with approximately a 30% increased risk of ovarian cancer in postmenopausal women. These findings suggest a potential environmental risk factor for ovarian cancer, highlighting the importance of further research and preventive strategies. The study was published in JAMA Network Open by Mark R. and colleagues.
Background of the prospective cohort study that made use of data gathered from the Women’s Health Initiative highlights the inherent hazards posed by ionizing radiation. In the past, it has been found that those women who had been exposed to ionizing radiation due to atomic bomb explosions had exhibited increased prevalence of ovarian cancers; however, studies pertaining to the potential effect of chronic low-level exposure to radon gas at home have not been explored to date. With the recruitment of 127,547 post-menopausal women in the age range of 50 to 79 from 40 clinics in the United States for over three decades (1993 to 2024), it is possible to establish a general connection between the radon zones at homes and ovarian health.
Key findings:
- Classification of the participants into low (<2 pCi/L), medium (2–4 pCi/L), and high (>4 pCi/L) exposure groups was based on their geocoded residential addresses and 1993 U.S. Geological Survey data.
- The number of cases included in the study amounted to 127,547 women, with a mean age of 63.1 years among whom there were 1,645 incident ovarian cancers during a mean follow-up period of 17.7 years.
- In particular, there was a significant dose response; although the medium exposure did not pose an increased risk (HR 1.13), the risk for the high radon exposure zone was 31% higher than in low zones (HR 1.31; 95% CI, 1.11-1.54).
- Moreover, attention was paid to the analysis of one of the histologies, serous, which is the most frequent type of ovarian cancer and usually aggressive.
- In this case, the risk among women in the high radon group was 38% higher than in low zones (HR 1.38; 95% CI, 1.09-1.74).
The current research on the association between ovarian cancer and the presence of radon in one’s place of residence is an important large-scale longitudinal investigation which demonstrates radon exposure in the house environment as a significant factor contributing to increased incidence and deaths from ovarian cancer among postmenopausal females. The research indicates that residing in a highly exposed region of radon, that is, areas where the radon concentration exceeds 4 pCi/L, entails an increased risk of ovarian cancer development, including its prevalent type, the serous cancer. Thus, the presented research is the first one of its kind to stress the importance of radon screening in homes as an opportunity for cancer prevention.
Reference:
Williamson MR, Whitsel EA, Smith RL, et al. Residential Radon Levels and Ovarian Cancer Among Postmenopausal Women. JAMA Netw Open. 2026;9(4):e268641. doi:10.1001/jamanetworkopen.2026.8641
