1. Relationship between urinary β2‐microglobulin concentration and mortality in a cadmium‐polluted area in Japan: A 35‐year follow‐up study
- Author
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Muneko Nishijo, Hideaki Nakagawa, Teruhiko Kido, Yasushi Suwazono, Masaru Sakurai, Kazuhiro Nogawa, Yuko Morikawa, Masao Ishizaki, and Yuuka Watanabe
- Subjects
0303 health sciences ,Creatinine ,medicine.medical_specialty ,Kidney ,business.industry ,Proportional hazards model ,Urinary system ,Mortality rate ,Hazard ratio ,010501 environmental sciences ,Toxicology ,01 natural sciences ,Gastroenterology ,03 medical and health sciences ,chemistry.chemical_compound ,medicine.anatomical_structure ,chemistry ,Renal tubular dysfunction ,Internal medicine ,Relative risk ,medicine ,business ,030304 developmental biology ,0105 earth and related environmental sciences - Abstract
The relationship between urinary β2 -microglobulin (β2 -MG) and the risk of all-cause mortality and cause-specific mortality in a cadmium (Cd)-polluted area was investigated in 3139 inhabitants (1404 men and 1735 women) of the Kakehashi River basin in Japan at 35-year follow-up. The subjects had been participants in the 1981-1982 health impact survey that assessed Cd-induced renal dysfunction, as measured by the urinary β2 -MG concentration. Hazard ratios were calculated to assess the risk of all-cause and cause-specific mortality according to the urinary β2 -MG concentrations. Risk ratios (RRs) were assessed using the Fine and Gray regression model to account for competing risks of cause-specific mortality. The mortality rate was significantly higher in participants with urinary β2 -MG concentrations >1000 μg/g creatinine (Cr) for men and >300 μg/g Cr for women. In the proportional hazard model, higher urinary β2 -MG concentrations were associated with higher risks of circulatory disease, digestive system diseases, and kidney and urinary tract diseases in men and women, and with senility for women. However, when competing risk was accounted for, the RRs were significantly higher only for kidney and urinary tract diseases in men and women (RR for each increment of 1000 μg/g Cr [95% confidence interval]: 1.02 [1.00-1.04] for men, and 1.01 [1.00-1.02] for women). The long-term prognosis of participants with renal tubular dysfunction was poor, most likely due to kidney and renal tract diseases.
- Published
- 2020