Tumors of the nervous system and pituitary gland associated with atomic bomb radiation exposure

In plain language

Among 80,160 atomic bomb survivors, nervous system tumor incidence rose linearly with radiation dose, most strongly for schwannoma. This is an association from acute exposure and does not directly measure risk from the fluoroscopy team's chronic low-dose exposure.

At a glance

Type of study: Original research, Prospective cohort study
Who was studied: General population
Size: n = 80,160 atomic bomb survivors
Where: Japan
Topics: Brain tumors Cancer risk
Summary based on: the abstract

What it found

There was a statistically significant dose-related excess of all nervous system tumors combined.
Key figures: ERR(Sv) = 1.2, 95% confidence interval [confidence interval (CI)] = 0.6 to 2.1
Schwannoma showed the highest excess relative risk per sievert.
Key figures: 4.5, 95% CI = 1.9 to 9.2
All other nervous system tumors as a group also had significantly elevated risk. Increases for meningioma, glioma and pituitary tumors were not statistically significant.
Key figures: ERR(Sv) = 0.6, 95% CI = 0.1 to 1.3
Dose-response relationships were linear. The authors conclude that moderate doses below 1 Sv are associated with elevated tumor incidence.
Key figures: <1 Sv
For nervous system tumors other than schwannoma, excess risks were higher in men and in those exposed during childhood.

Limits to keep in mind

Survivors had an acute, high-dose-rate, whole-body exposure, which differs from the chronic, low-dose, partial-body occupational exposure of fluoroscopy staff. Several tumor-specific estimates have wide confidence intervals that include no effect.

Two Central Nervous System Tumors in One Catheter Lab: Time to Rethink Radiation Protection (2026, Retrospective cohort study)
Cancer Risks in U.S. Radiologic Technologists Working with Fluoroscopically Guided Interventional Procedures, 1994-2008 (2024, Prospective cohort study)
Hidden hazards in the cath lab: cancer morbidity among interventional cardiologists (2026, Systematic review)
Occupational Health Hazards in the Cardiac Catheterization Laboratory: Results of the 2023 SCAI Survey (2025, Cross-sectional survey)
Radiation exposure in interventional cardiology: a narrative review of health effects and novel approaches to ensure radiation safety (2025, Narrative review)

How this summary was made

ORSIF prepared this summary with AI assistance from the abstract of the paper. A program then checked that the passage supporting each finding appears word for word in that source. A person has not yet reviewed each summary, so read the original before relying on a number. ORSIF summarizes research and does not endorse any product or company. Report a problem with this summary.

Prepared November 3, 2026.