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Updated: May 19, 2026

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Yusho: 43 years later.

Takesumi Yoshimura¹

¹Fukuoka Women's University, Fukuoka City, Japan. Tak-yoshi@fwu.ac.jp

The Kaohsiung Journal of Medical Sciences

|August 9, 2012

Summary

Yusho disease, caused by dioxins, has seen elevated cancer mortality in males. Recent studies show average dioxin levels in Japanese blood and food intake, alongside the launch of a large birth-cohort study.

Area of Science:

Environmental Health
Toxicology
Epidemiology

Background:

Yusho disease, originating in 1968 Japan, resulted from dioxin-related compounds like PCBs and PCDFs in contaminated rice oil.
As of 2011, 1961 Yusho cases were registered, with 539 deceased.

Observation:

A retrospective cohort study indicated elevated standardized mortality ratios (SMRs) for all cancers and lung cancer in males among Yusho patients.
The SMR for liver cancer in males showed a decreasing trend over time.
In 2011, average dioxin blood concentration in Japan was 19 pg-TEQ/g-fat, with average daily intake from food at 0.82 pg-TEQ/kg-body weight/day.

Findings:

The study highlights ongoing concerns regarding Yusho disease and dioxin exposure in Japan.
Elevated cancer mortality, particularly lung cancer in males, is associated with Yusho disease.

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Significant dioxin accumulation and intake through food consumption are documented in the Japanese population.

Implications:

Findings underscore the long-term health impacts of dioxin exposure and the need for continued monitoring.
The Japan Environment and Children's Study, a large birth-cohort study, was launched in 2011 to investigate environmental factors affecting children's health.
This comprehensive study aims to recruit 100,000 mother-child pairs, providing valuable data on environmental exposures and health outcomes from pregnancy to age 13.