The Latent period of Childhood Thyroid Cancer

The following statements by staff of Fukushima Medical University and Health Management are contradicted by the research findings listed below:

“Researchers at Fukushima Medical University, which has been taking the leading role in the study, have said they do not believe the most recent cases are related to the nuclear crisis.”

They point out that thyroid cancer cases were not found among children hit by the 1986 Chernobyl nuclear accident until four to five years later.” end quote.
Japan Times. Kyodo. 06/05/2013 http://www.japantimes.co.jp/news/2013/06/05/national/fukushima-survey-lists-12-confirmed-15-suspected-thyroid-cancer-cases/#.UbCB7Ovrk7A

Further : “…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.” Source: Thyroid cancer hits Fukushima 5 Jun 2013, 12:57 pm – Source: AAP, SBS TV Australia, http://www.sbs.com.au/news/article/1774837/Thyroid-cancer-hits-Fukushima

The above statements by staff of Fukushima Medical University and Health Management:

1.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1356259/

Journal List
Ann Surg
v.239(4); Apr 2004
PMC1356259

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.

http://www.rri.kyoto-u.ac.jp/NSRG/reports/kr79/kr79pdf/Malko2.pdf

Chernobyl Radiation-induced Thyroid Cancers in Belarus
Mikhail V. MALKO
Joint Institute of Power and Nuclear Research, National Academy of Sciences of Belarus
Krasin Str. 99, Minsk, Sosny, 220109, Republic
of Belarus: mvmalko@malkom.belpak.minsk.by QUOTE: ” absence of marked latency period is another feature of radiation-induced thyroid cancers caused in Belarus as a result of this accident. “
end quote

http://www.ncbi.nlm.nih.gov/pubmed/17452969

Nat Clin Pract Endocrinol Metab. 2007 May;3(5):422-9.
Mechanisms of Disease: molecular genetics of childhood thyroid cancers.
Yamashita S, Saenko V.
Source

Department of Molecular Medicine, Atomic Bomb Disease Institute, Nagasaki University, Graduate School of Biomedical Sciences, Japan. shun@nagasaki-u.ac.jp
Abstract

“The incidence of thyroid cancer in children increased dramatically in the territories affected by the Chernobyl nuclear accident; this increase is probably attributable to (131)I and other short-lived isotopes of iodine released into the environment. There was a broad range of latency periods in children who developed thyroid cancer; some periods were less than 5 years.”
end quote.

Childhood thyroid cancer: comparison of Japan and Belarus.
Shirahige Y, Ito M, Ashizawa K, Motomura T, Yokoyama N, Namba H, Fukata S, Yokozawa T, Ishikawa N, Mimura T, Yamashita S, Sekine I, Kuma K, Ito K, Nagataki S.
First Department of Internal Medicine, Nagasaki University School of Medicine, Japan.
Endocr J. 1998 Apr;45(2):203-9.

https://www.jstage.jst.go.jp/article/endocrj1993/45/2/45_2_203/_pdf Free Full Text.

“All of the preceding thyroid carcinomas developed after longer latency periods,
whereas tumors arising in the Chernobyl population began developing with surprising rapidity and short latency.” (pdf page 2, journal page 204).

The authors cite the Chernobyl-Sasakawa Health and Medical Cooperation Project as a source in the Abstract. The public data published by this organization is Chernobyl A Decade – Proceedings of the Fifth Chernobyl Sasakawa Medical Cooperation Symposium, Kiev, Ukraine, 14-15 October 1996 (International Congress S.) Shunichi Yamashita (Edited by), Yoshisada Shibata (Edited by)
The publication is available at : http://www.smhf.or.jp/data01/chernobyl_decade.pdf

“Minimum Latency & Types or Categories of Cancer” John Howard, M.D., Administrator World Trade Center Health Program, 9.11 Monitoring and Treatment, Revision: May 1, 2013,
http://www.cdc.gov/wtc/pdfs/wtchpminlatcancer2013-05-01.pdf states that the latent period for Thyroid cancer is :
2.5 years, based on low estimates used for lifetime risk modeling of low-level ionizing radiation studies”, pdf page 1.


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