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Environment International | 2011

Odd-numbered perfluorocarboxylates predominate over perfluorooctanoic acid in serum samples from Japan, Korea and Vietnam

Kouji H. Harada; Toshiaki Hitomi; Tamon Niisoe; Katsunobu Takanaka; Sigetosi Kamiyama; Takao Watanabe; Chan-Seok Moon; Hye-Ran Yang; Nguyen Ngoc Hung; Akio Koizumi

Perfluorooctanoic acid (PFOA) has recently attracted attention as a potential health risk following environmental contamination. However, information detailing exposure to perfluorinated carboxylic acids (PFCAs) other than PFOA is limited. We measured the concentrations of PFCAs (from perfluorohexanoic acid to perfluorotetradecanoic acid) in serum samples obtained from patients in Japan (Sendai, Takayama, Kyoto and Osaka) between 2002 and 2009, Korea (Busan and Seoul) between 1994 and 2008 and Vietnam (Hanoi) in 2007/2008. Total PFCA levels (geometric mean) were increased from 8.9 ng mL(-1) to 10.3 ng mL(-1) in Japan; from 7.0 ng mL(-1) to 9.2 ng mL(-1) in Korea; and were estimated at 4.7 ng mL(-1) in Vietnam. PFCAs of greater length than PFOA were significantly increased in Sendai, Takayama and Kyoto, Japan, and levels of long-chain PFCAs exceeded PFOA levels in serum. Among these PFCAs, perfluoroundecanoic acid (PFUnDA) was the predominant component (28.5%), followed by perfluorononanoic acid (PFNA 17.5%), perfluorodecanoic acid (PFDA 7.9%), perfluorotridecanoic acid (PFTrDA 6.1%) and perfluorododecanoic acid (PFDoDA 1.8%). Odd-numbered PFCAs (PFNA, PFUnDA and PFTrDA) were also observed in Korea and Vietnam and their presence increased significantly in Korea between 1994 and 2007/2008. The proportion of long-chain PFCAs in serum was relatively high compared to reports in Western countries. Further investigations into the sources and exposure routes are needed to predict the future trajectory of these serum PFCA levels.


Journal of the National Cancer Institute | 1982

Intestinal Metaplasia in Japan: Association With Diet

Abraham M. Y. Nomura; Hiroshi Yamakawa; Takuzo Ishidate; Sigetosi Kamiyama; Hisayuki Masuda; Grant N. Stemmermann; Lance K. Heilbrun; Jean H. Hankin


Cancer Research | 1979

Fecal bile acids in two Japanese populations with different colon cancer risks.

Howard F. Mower; Ralph M. Ray; Robert Shoff; Grant N. Stemmermann; Abraham M. Y. Nomura; Gary Glober; Sigetosi Kamiyama; Akio Shimada; Hiroshi Yamakawa


Cancer Research | 1982

Fecal Mutagens in Two Japanese Populations with Different Colon Cancer Risks

Howard F. Mower; D. Ichinotsubo; L. W. Wang; M. Mandel; Stemmermann Gn; Abraham M. Y. Nomura; Lance K. Heilbrun; Sigetosi Kamiyama; Akio Shimada


Tohoku Journal of Experimental Medicine | 1972

Osteoporosis Prevalence and Nutritional Intake among the People in Farm, Fishing and Urban Districts

Sigetosi Kamiyama; Satoru Kobayashi; Shoichi Abe; Eiji Takahashi; Eikichi Wakamatsu; Tatsuya Kurashina


Tohoku Journal of Experimental Medicine | 1955

Synthesis of artificial group A and B substances.

Hajime Masamune; Sen-itiroh Hakomori; Haruo Numabe; Ziroh Akama; Sigetosi Kamiyama


Pharmacology & Toxicology | 1990

Structure and pulmonary toxicity relationship on O,O-dimethyl S-alkyl phosphorothioate esters.

Jun-ichi Hasegawa; Yasuhiko Wada; Masato Sageshima; Masahiro Suzuki; Sigetosi Kamiyama; Nobuo Abe; Akio Koizumi


Tohoku Journal of Experimental Medicine | 1969

Comparative Study on Physical Condition and Blood Chemistry of Inhabitants in Farm and Fishing Villages in Relation to Their Difference in Mortality from Cerebrovascular Disease

Sigetosi Kamiyama; Fumio Yamada; Satoru Kobayashi; Eiji Takahashi


Tohoku Journal of Experimental Medicine | 1968

Osteoporosis in hypertensive and non-hypertensive subjects. An epidemiologic approach to the etiology of osteoporosis.

Sigetosi Kamiyama; Satoru Kobayashi; Eiji Takahashi; Eikichi Wakamatsu; Tatsuya Kurashina


Tohoku Journal of Experimental Medicine | 1965

Experimental Studies of the Effect of Calcium Deficient Diet on the Development of Cerebrovascular Diseases

Sigetosi Kamiyama; Kozo Ishiguro; Yoshiaki Kawakami; Satoru Kobayashi; Fumio Yamada; Eiji Takahashi

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