Scientist: FDA suppressed imaging safety concerns
By MATTHEW PERRONE
A former Food and Drug Administration scientist said Tuesday his job was eliminated after he raised concerns about the risks of radiation exposure from high-grade medical scanning.
Dr. Julian Nicholas said at a public hearing that he and other FDA staffers “were pressured to change their scientific opinion,” after they opposed the approval of a CT scanner for routine colon cancer screening. Nicholas said that he objected to exposing otherwise healthy patients to the cancer risks of radiation.
After FDA officials pushed ahead with plans to clear the device, Nicholas, now a physician at the Scripps Clinic in San Diego, said he and eight other staffers raised their concerns with the division’s top director Dr. Jeffrey Shuren last September. The device apparently is still under review.
“Scientific and regulatory review process for medical devices was being distorted by managers who were not following the laws,” Nicholas said. A month later Nicholas’ position was terminated, he said.
The allegations about suppression of scientific dissent come at an inopportune time for the agency.
The FDA announced an effort to improve scanning safety in February after three California hospitals reported hundreds of acute radiation overdoses last year, with many patients reporting lost hair and skin redness.
Hundreds of studies have linked certain types of radiation, including the type used in medical imaging, to cancer that can surface decades later.
FDA medical reviewer Dr. Robert Smith, a colleague of Nicholas who also presented at Tuesday’s public meeting, said he hoped the FDA would learn a lesson from Nicholas’ testimony.
“Science must not be ignored, suppressed or distorted as that endangers the public,” Smith told the audience.
Agency spokesman Dick Thompson said in a statement the FDA’s inspector general looked into allegations of retaliation against agency scientists and did not pursue further action or investigation. The agency’s policies do not allow staffers to be penalized for expressing scientific views, he added.
Nicholas said, however, he has never been contacted and is still waiting to hear from the FDA’s inspector. He stresses that the inspector’s jurisdiction is criminal investigations, not allegations of improper conduct.
As a reviewer of medical device applications, Nicholas repeatedly rejected a manufacturers’ request to market a CT scanner specifically for colon cancer screening. According to Nicholas, between 1.5 and 2 percent of cancers are caused by CT scanning, and he did not want to see scanning used when a conventional colonoscopy could be used instead.
CT scans provide detailed, three-dimensional images of the body, but at a cost: one CT chest scan carries as much radiation as nearly 400 chest X-rays, according to the FDA.
Nicholas said FDA rules legally barred from naming the manufacturer or discussing the details of its application.
In a June 2009 letter to senior managers, Nicholas stressed that patients should be warned of the radiation risks of CT scanning.
“I hope you understand that the failure to include a warning on the label will mean that patients will undoubtedly develop abdominal cancer and leukemia,” Nicholas wrote “It may not happen tomorrow, but yes, sadly it will happen.”
Nicholas said he was ridiculed by agency managers for “raising the bugaboo of radiation.”
CT scans became popular because they offer a quick, relatively cheap way to get an almost surgical view of the body. Doctors are free to use them as they choose, but FDA approval for specific indications allows companies to tout those uses in marketing materials.
The average American’s radiation exposure has nearly doubled in the last three decades, largely due to CT tests, according to the FDA.