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Computed tomography (CT) scans are overused in the United States and could account for up to 5% of all cancer cases in the near future. This is the primary conclusion of a study published this Monday in the journal *JAMA Internal Medicine*, which tallied approximately 93 million CT scans performed in 2023; the authors estimate that the radiation from these procedures could lead to 103,000 future cancer cases. The researchers note that this figure is 3 to 4 times higher than previous estimates.

Computed tomography (CT) is widely used to detect tumors and diagnose numerous diseases. Since 2007, the annual number of such examinations in the United States has risen by 30%—a continuing upward trend.

At the same time, CT scans expose patients to ionizing radiation (which causes potentially carcinogenic DNA mutations), and it has long been known that this technology carries an increased cancer risk. Specifically, the radiation received during these tests can lead to lung cancer, breast cancer, and other types of tumors. The risk is highest for infants, followed by children and adolescents.

In 2023, an international study conducted by scientists at ISGlobal in Barcelona highlighted the impact of radiation exposure, estimating that for every 10,000 children examined using this technique, one or two could develop a blood cancer within the following 12 years as a result of that exposure.

https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2832778 (2025).--

Guillermou's avatar

CANADIAN STUDY. A Canadian study of 89,835 women regarding mammography.

The Canadian National Breast Screening Study followed 89,835 women aged 40–59 for 25 years.

It found:

• cumulative breast cancer mortality: practically the same;

• mortality hazard ratio (HR): 0.99 (95% CI 0.88–1.12);

• 106 additional persistent cancers in the mammography group;

• the authors estimated that 22% of the invasive cancers detected through screening were overdiagnosed.

Conclusion: Annual mammography in women aged 40–59 does not reduce breast cancer mortality beyond what is achieved through physical examination or usual care, in a setting where adjuvant therapy for breast cancer is readily available. Overall, 22% (106/484) of screen-detected invasive breast cancers were overdiagnosed, which amounts to one overdiagnosed breast cancer for every 424 women who underwent mammography screening in the trial.

https://www.bmj.com/content/348/bmj.g366?utm.com (2014)

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