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Cancer Sci. 2019 Feb;110(2):817-827. doi: 10.1111/cas.13912. Epub 2019 Jan 20.

Histopathological analysis of papillary thyroid carcinoma detected during ultrasound screening examinations in Fukushima.

Author information

1
Department of Thyroid Endocrinology, Fukushima Medical University, Fukushima, Japan.
2
Laboratory of Morphology of Endocrine System, State Institution "V.P. Komisarenko Institute of Endocrinology and Metabolism of the National Academy of Medical Sciences of Ukraine", Kyiv, Ukraine.
3
Department of Radiation Molecular Epidemiology, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan.
4
Department of Diagnostic Pathology, Fukushima Medical University, Fukushima, Japan.
5
Department of Diagnostic Pathology, Nagasaki Medical Center, Omura, Japan.
6
Department of Global Health, Medicine and Welfare, Atomic Bomb Disease Institute, Nagasaki University, Nagasaki, Japan.
7
Department of Fundamental and Applied Problems of Endocrinology, State Institution "V.P. Komisarenko Institute of Endocrinology and Metabolism of the National Academy of Medical Sciences of Ukraine", Kyiv, Ukraine.
8
Fukushima Medical University, Fukushima, Japan.

Abstract

Thyroid ultrasound screening of young residents in Fukushima Prefecture, Japan, showed a high detection rate of papillary thyroid carcinoma (PTC). Detailed morphological analysis of these tumors was not presented to date. This study sets out to evaluate changes in histopathological and invasive characteristics of Fukushima PTC with time after the nuclear accident of March 2011 in all available cases and in different age subgroups. Histological specimens of 115 PTCs from patients aged 18 years or younger at the time of the Fukushima Dai-ichi Nuclear Power Plant accident, who underwent surgical resection at Fukushima Medical University during 2012-2016, were reviewed. Patients were divided into those treated during the first 4 years after the accident (n = 78, shorter-onset) or later (n = 37, longer-onset). The whole group and 3 age subgroups: children (aged less than 15 years), adolescents (aged from 15 to less than 19 years), and young adults (aged from 19 years) at surgery were analyzed. No statistically significant time-related changes in tumor structure or invasiveness were found in the whole group or in age-matched subgroups. Statistically significant age-related downtrend was observed for intrathyroid spread in the whole group of patients. The absence of temporal changes in tumor morphological characteristics and tumor invasiveness strongly suggests common etiology of the shorter- and longer-onset Fukushima PTCs, which are unlikely related to the effect of exposure to very low doses of radiation.

KEYWORDS:

Fukushima nuclear accident; comparative study; mass screening; papillary thyroid carcinoma; surgical pathology

PMID:
30548366
PMCID:
PMC6361578
DOI:
10.1111/cas.13912
[Indexed for MEDLINE]
Free PMC Article

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