Latency Period of Thyroid Neoplasia After Radiation Exposure

Journal List
Ann Surg
v.239(4); Apr 2004

Latency Period of Thyroid Neoplasia After Radiation Exposure
Shoichi Kikuchi, MD, PhD, Nancy D. Perrier, MD, Philip Ituarte, PhD, MPH, Allan E. Siperstein, MD, Quan-Yang Duh, MD, and Orlo H. Clark, MD

From the From Department of Surgery, UCSF Affiliated Hospitals, San Francisco, California.

“Latency Period of Benign and Malignant Thyroid Tumors

Although some sporadic tumors unrelated to radiation may be included among our patients, the shortest latency period for both benign and malignant tumors was 1 year as occurred in 3 patients, whereas the longest time was 69 and 58 years, respectively (Fig. 1).”

end quote. Please read full paper at the above link.

Japanese nuclear “authorities” claim that childhood thyroid cancer caused by radiation exposure takes FIVE YEARS to occur. (latency five years).

Where do they get this totally wrong idea from and is it a self serving statement in the legal sense?

For instance: “But experts at Fukushima Medical University said that it is too early to link the cancer cases to the nuclear disaster. They said the 1986 Chernobyl accident showed that it takes at least four to five years before thyroid cancer is detected.” AAP, as reported by SBS TV Australia.

“Conclusion by Pr. Suzuki of the infamous Fukushima Medical University; “not related to the nuclear accident. It took 5 yrs in Chernobyl to see an increase in thyroid cancers”” Statement reported by Nelson Surjon of Tokyo, Japan.

What did the Chernobyl Accident show in this regard?

When was the first study of Thyroid cancer resultant from Chernobyl completed? Does the five year period cited repeatedly by nuclear advocates actually refer in fact to something other than the latency period of childhood thyroid cancer? Did it take actually, five years to undertake the survey? If it did, is the time taken by scientists to do the work reflect in any the latency period of childhood thyroid cancer, which as establish can be as short as 12 months, 1 year, NOT the five years so zealously quoted by pro nuclear forces in Japan.

When was the first relevant study of childhood thyroid cancer resultant from Chernobyl undertaken. I cannot read Russian or any other language apart from English.

One of the first is this one:

Study Reveals First Direct Evidence that Risk of Thyroid Cancer After Chernobyl Rises with Increasing Radiation Dose

SEATTLE — Sep. 1, 2004 — The risk of thyroid cancer rises with increasing radiation dose, according to the most thorough risk analysis for thyroid cancer to date among people who grew up in the shadow of the 1986 Chernobyl power-plant disaster.

The incidence of thyroid cancer was 45 times greater among those who received the highest radiation dose as compared to those in the lowest-dose group, according to a team of American and Russian researchers led by Scott Davis, Ph.D., and colleagues at Fred Hutchinson Cancer Research Center. They report their findings in the September issue of Radiation Research.

“This is the first study of its kind to establish a dose-response relationship between radiation dose from Chernobyl and thyroid cancer,” said Davis, referring to the observation that as radiation doses increase, so does the risk of thyroid cancer. “We found a significant increased risk of thyroid cancer among people exposed as children to radiation from Chernobyl, and that the risk increased as a function of radiation dose.”

Having such information in hand, Davis said, may help officials better predict what long-term health effects to expect in the event of a similar nuclear accident or terrorist attack.

“Another potential benefit of the findings is that it allows officials to more accurately understand and document the magnitude of the thyroid-cancer burden that has resulted from Chernobyl. This information will be important in designing and maintaining programs targeted toward the victims of the disaster.”

While about 30 people were killed immediately from the blast, which remains the worst accident of its kind in history, an estimated 5 million people were exposed to the resulting radiation.

Prior to Chernobyl, thyroid cancer in children was practically nonexistent. Today we see dozens and dozens of cases a year in the regions contaminated by the disaster, and the incidence continues to rise,” Davis said. “This provides some evidence that there’s an excess of thyroid cancer in children and in people who were children at the time of the accident. However until now nobody had taken the next step to find out just how much a risk there is and whether it rises along with radiation dose.”

“After all these years, many efforts have been made by various research groups around the world to study the health effects of Chernobyl, and hundreds of scientific papers have been published. But ours is the first report that provides quantitative estimates of thyroid-cancer risk in relation to individual estimates of radiation dose,” said Davis, also chairman of the Department of Epidemiology at the University of Washington School of Public Health and Community Medicine in Seattle.

end partial quote.

The paper is entitled “Risk of Thyroid Cancer in the Bryansk Oblast of the Russian Federation after the Chernobyl Power Station Accident,” and is cataloged here:

Risk of Thyroid Cancer in the Bryansk Oblast of the Russian Federation after the Chernobyl Power Station Accident
Scott Davis 1a,b, Valery Stepanenko c, Nikolai Rivkind d, Kenneth J. Kopecky a,e, Paul Voillequé f, Vladimir Shakhtarin c, Evgeni Parshkov c, Sergei Kulikov g, Evgeni Lushnikov c, Alexander Abrosimov c, Vladislav Troshin h, Galina Romanova d, Vladimir Doroschenko d, Anatoli Proshin d, and Anatoly Tsyb c

a Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington

b Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington

c Medical Radiological Research Center, Obninsk, Russia

d Bryansk Diagnostic Center, Bryansk, Russia

e Department of Biostatistics, School of Public Health and Community Medicine, University of Washington, Seattle, Washington

f MJP Risk Assessment, Denver, Colorado

g National Center of Hematology, Moscow, Russia

h Bryansk Institute of Pathology, Bryansk, Russia

I have emailed Dr. Davis asking for his opinion as to what the latency period for childhood thyroid cancer is. I also asked him for a copy of the above paper.

I urge the media, including in this case, AAP and SBS TV Australia, to dig a little deeper into the source documents rather than just repeat what appears to be self serving pap from medicos and others who are acting on behalf of authorities who may well be more interested in covering their own arses than in telling the truth.

It took five minutes this morning for me to confirm that the latency period for thyroid cancer can be a short as 12 months.

The facts indicate that northern Japan may be suffering a long term increase in the diagnosis and rate of diagnosis of childhood thyroid abnormalities including thyroid cancer.

The nuclear industry presents thyroid cancer and thyroid removal as minor events. Is this view correct?