Latent Period of Childhood Thyroid Cancer

The following quotations give examples of the characterization given to the Chernobyl findings by Fukushima Medical University and Health Management Survey Staff:

“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

What does the Chernobyl data show?

1. 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.

This source states: “The high incidence of childhood thyroid cancer in Belarus is suspected to be due to radiation exposure after the Chernobyl reactor accident” (Abstract) (pdf page 2, journal page 204).

“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

The two papers cited above were co-authored by the same Dr. Yamashita who since March 2011 has taken a radically different stance on both latency of the disease and the speed of its development. Who is right? Pre 311 Yamashita or Post 311 Yamashita?

What do others write in peer reviewed qualified medical papers?

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
http://www.rri.kyoto-u.ac.jp/NSRG/reports/kr79/kr79pdf/Malko2.pdf
QUOTE: ” absence of marked latency period is another feature of radiation-induced thyroid cancers caused in Belarus as a result of this accident. “

“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.

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).” As published in Journal List nAnn Surg v.239(4); Apr 2004 PMC1356259, available full text at
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1356259/

Do the staff of Fukushima Prefectural Health Management Survey, Fukushima Prefectural Health Management Survey Review Committee, Fukushima Medical University, Doctor S. Yamashita and Dr Suzuki characterize the Chernobyl Findings in a manner which contradicts the actual findings of those relevant Chernobyl related peer reviewed, qualified, published papers?
If so, why?

charts above from : 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. “

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2 thoughts on “Latent Period of Childhood Thyroid Cancer

    1. nuclearhistory Post author

      Good spot, Dud. Importantly, Japanese scientists recorded the arrival of Chernobyl fallout. And a couple of years later doctors in Japan began to become concerned at an increase in childhood cancers. I will put some source material up in regard to both the arrival of Chernobyl fallout in Japan and the increase in childhood cancer in Japan from the late 1980s and lasted until the 1990s. I will post the material today.

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