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135 results on '"Okubo, Toshiteru"'

13. A prospective cohort study of chromium plating workers in Japan

Author

Takahashi, Ken and Okubo, Toshiteru

Subjects
Industrial toxicology -- Analysis, Chromium -- Health aspects, Occupational diseases -- Japan, Occupational mortality -- Japan, Environmental issues, Health
Abstract

Chromium is an essential metallic element which, in trace amounts, is required for normal glucose (sugar) metabolism. At higher levels it has been found to create an increased risk for lung cancer. The chromium plating industry exposes its workers to high levels of six-valency chromium compounds, which is alleged to account for the high level of lung cancer among these workers. Information on workers from 415 plating factories in Tokyo was gathered to investigate cancer mortality among chromium platers. Researchers identified 626 employees who had worked with chromium plating for more than six months, and 567 workers who had performed plating with metals other than chromium for more than six months. The workers were employed between 1970 and 1976, and were followed through December 1987. Each worker's health status was traced through the family registration system of Japan, and cause of death was taken from death certificates. Between 1976 and 1987, 156 of the 1,193 workers had died. Lung cancer was the only cause of death that was higher than expected for both plater groups. The total number of deaths from all causes was lower than expected. The group that had been exposed to chromium most recently had the lowest mortality, perhaps because of improved factory conditions. Increased lung cancer mortality was associated with chromium exposures during the earliest years of the study period. These results suggest that occupational exposure to metal plating is associated with an increase in lung cancer mortality. Contributing factors other than chromium need further study. (Consumer Summary produced by Reliance Medical Information, Inc.), A Prospective Cohort Study of Chromium Plating Workers in Japan INCREASED RISK of lung cancer among chromium-exposed workers in chromate-producing plants is well documented in epidemiological studies [1-3] and has [...]

Published
1990

16. EPIDEMIOLOGICAL STUDY OF HEALTH EFFECTS IN FUKUSHIMA NUCLEAR EMERGENCY WORKERS—STUDY DESIGN AND PROGRESS REPORT.

Author

Kitamura, Hiroko, Okubo, Toshiteru, Kodama, Kazunori, and Group, Nuclear Emergency Workers Study

Subjects
FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011, PHYSIOLOGICAL effects of ionizing radiation, NUCLEAR power plant employees, INDUSTRIAL hygiene, PERIODIC health examinations
Abstract

Between 14 March and 16 December 2011, the radiation dose limit for emergency work was tentatively raised from an effective dose of 100–250 mSv by the Japanese Government after the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. The objective of this study is to clarify the long-term health effects of radiation on the emergency workers involved during that period, based on a detailed evaluation of the radiation exposures and long-term monitoring. The potential subjects of the study are the approximately 20 000 workers who were engaged in emergency operations at FDNPP during the period described above. During the first phase of this project, the first 5 years from 2014, we plan to set up a research scheme and establish a cohort. To date, the establishment of the scheme for general health examinations is nearly complete. As of 31 January 2017, 5419 emergency workers (27.4% of the subjects) have agreed to participate in the study. We will continue our efforts to recruit additional potential subjects during the first phase to maximize the size of the cohort. [ABSTRACT FROM AUTHOR]

Published
2018
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21. Address

Author

Okubo, Toshiteru and Okubo, Toshiteru

Abstract

Acta medica Nagasakiensia. 2005, 50(supl.2), p.viii-viii

Published
2005

39. Relationship between Asbestos Exposures and 8-Hydroxydeoxyguanosine Levels in Leukocytic DNA of Workers at a Chinese Asbestos-material Plant

Author

Takahashi, Ken, primary, Pan, Guowei, additional, Kasai, Hiroshi, additional, Hanaoka, Tomoyuki, additional, Feng, Yiping, additional, Liu, Ning, additional, Zhang, Shujuan, additional, Xu, Zhaoyi, additional, Tsuda, Tohru, additional, Yamato, Hiroshi, additional, Higashi, Toshiaki, additional, and Okubo, Toshiteru, additional

Published
1997
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