The effect of fibre size on the in vivo activity of UICC crocidolite
1984
Effect of Fibre Size on Crocidolite Activity
Sample size: 210
publication
Evidence: moderate
Author Information
Author(s): J.C. Wagner, D.M. Griffiths, R.J. Hill
Primary Institution: Medical Research Council Pneumoconiosis Unit
Hypothesis
Does the size of crocidolite fibres affect their ability to induce mesothelioma in rats?
Conclusion
Crocidolite fibres, regardless of size, can induce mesothelioma in rats.
Supporting Evidence
- Crocidolite fibres induced mesothelioma in all treatment groups.
- Previous studies suggested only long fibres were biologically active.
- Histological examination confirmed the presence of long fibres in granulomata.
Takeaway
This study found that even small crocidolite fibres can cause cancer in rats, which was surprising because it was thought only long fibres could do that.
Methodology
Rats were injected with different sizes of crocidolite fibres to observe the development of mesothelioma.
Limitations
The study may not fully account for the biological activity of fibres based on size alone.
Participant Demographics
210 F344 rats, mixed sexes, aged 37 to 57 days.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
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