Some Hiroshima Survivors at Thyroid Cancer Risk

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In their study, Hamatani's team found that between 1958 and 1998, there were 63 cases of thyroid cancer attributable to A-bomb radiation exposure, of which 90 percent were of the papillary variety.

They also extracted genetic material called RNA from thyroid tissue samples supplied by 50 patients who had been exposed to atomic bomb radiation, along with 21 patients who were not exposed.

The comparative genetic profiles revealed that younger men and women who lived close to the bomb site when exposed to radioactive fallout, and who went on to develop PTC, were more likely to have the less frequent chromosomal rearrangement.

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Hamatani cautioned, however, that he and his colleagues still do not know exactly how radiation exposure might have contributed to the onset of RET/PET rearrangements. It's even possible that radiation exposure may not have played a role in the development of PTC among patients who had the chromosomal rearrangement before they were diagnosed with the disease. Hamatani noted that, among childhood PTC cases in particular, such chromosomal shifts are relatively common, regardless of whether a child has been exposed to radiation or not.

Because of this, Hamatani stressed that any link between radiation and chromosomal changes, "needs to be confirmed with additional PTC patients in the future".

In the meantime, Dr. Alfred I. Neugut, a professor of medicine and epidemiology at Columbia University College of Physicians and Surgeons, and co-director of cancer prevention at New York Presbyterian Hospital, in New York City, said the association "makes biological sense."

"The fact that radiation exposure is associated with thyroid cancer is well known and not news," he noted. "But now, as research technology has caught up with scientific expectations, they're now able to identify the specific chromosomal anomaly that causes the cancer. And, indeed, this is exactly what you would expect."

More information

For more about radiation and its impact on health, visit the U.S. Nuclear Regulatory Commission.

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