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Asbestos exposure as a risk factor for retroperitoneal fibrosis
Toomas Uibu1, Panu Oksa, Anssi Auvinen
1Department of Respiratory Medicine, Tampere University Hospital, Finland. toomas.uibu@saunalahti.fi
Background:
Retroperitoneal fibrosis (RPF) is an uncommon disease with unknown causation in most cases. The pathognomonic finding is a fibrous mass covering the abdominal aorta and the ureters. Our aim was to clarify the possible role of asbestos exposure in the development of RPF. The hypothesis was based on the ability of asbestos to cause fibrosis in pulmonary and pleural tissue.
Methods:
We undertook a case-control study of 43 patients with the disease (86% of eligible cases) treated in three university hospital districts of Finland in 1990-2001. For every patient, five population-based controls were selected, matched by age, sex, and central hospital district. We assessed asbestos exposure and medical history using a postal questionnaire and a personal interview. Of the 215 eligible controls, 179 (83%) participated in the study.
Findings:
The age-standardised incidence of RPF was 0.10 (95% CI 0.07-0.14) per 100?000 person-years. The disease was strongly associated with asbestos exposure. The odds ratio (OR) was 5.54 (1.64-18.65) for less than 10 fibre-years of asbestos exposure and 8.84 (2.03-38.50) for 10 or more fibre-years, the attributable fraction being 82% and 89%, respectively. Other risk factors were previous use of ergot derivates (OR 9.92 [1.63-60.26]), abdominal aortic aneurysm (OR 6.73 [0.81-56.08]), and smoking for more than 20 pack-years (OR 4.73 [1.28-17.41]).
Interpretation:
Our results show that occupational asbestos exposure is an important causal factor for RPF. For patients with work-related asbestos exposure, RPF should be considered an occupational disease.
Insights
Occupational asbestos exposure is a significant cause of retroperitoneal fibrosis (RPF). This finding suggests RPF should be recognized as an occupational disease in exposed individuals.
Area of Science:
- Environmental Health
- Occupational Medicine
- Fibrotic Diseases
Background:
- Retroperitoneal fibrosis (RPF) is a rare condition of unknown cause, characterized by a fibrous mass around the aorta and ureters.
- Asbestos is known to cause pulmonary and pleural fibrosis, prompting investigation into its role in RPF.
Purpose of the Study:
- To investigate the potential link between asbestos exposure and the development of retroperitoneal fibrosis (RPF).
- To determine if occupational asbestos exposure is a causal factor in RPF.
Main Methods:
- A case-control study involving 43 RPF patients and 179 matched population-based controls in Finland (1990-2001).
- Asbestos exposure and medical history were assessed via postal questionnaires and personal interviews.
Main Results:
- RPF showed a strong association with asbestos exposure, with odds ratios increasing with cumulative exposure.
- Significant risk factors included asbestos exposure (OR 5.54-8.84), ergot derivative use (OR 9.92), abdominal aortic aneurysm (OR 6.73), and heavy smoking (OR 4.73).
- Attributable fractions for asbestos exposure were high, reaching 82-89%.
Conclusions:
- Occupational asbestos exposure is identified as a key causal factor for retroperitoneal fibrosis.
- RPF in individuals with work-related asbestos exposure should be classified as an occupational disease.
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