Table 1 Incidence of bronchiolo-alveolar cell hyperplasia in rats sacrificed at week 52
Treatment Group | Number of rats examined | Number of rats with bronchiolo-alveolar hyperplasia |
|---|---|---|
Vehicle | 5 | 0 |
MWCNT-A (0.5 mg) | 5 | 3 |
MWCNT-A (1.0 mg) | 5 | 5** |
MWCNT-B (0.5 mg) | 5 | 5** |
MWCNT-B (1.0 mg) | 5 | 5** |
Crocidolite | 5 | 5** |