| Vehicle | MWCNT-A | MWCNT-B | Crocidolite | ||
---|---|---|---|---|---|---|
 | 0.5 mg | 1.0 mg | 0.5 mg | 1.0 mg | 1.0 mg | |
Animals examined | 19 | 20 | 20 | 20 | 20 | 20 |
Mean Survival (wks) | 98.2 | 102.2 | 100.4 | 95.6 | 100.0 | 97.9 |
Hyperplasia | 0 | 3 | 2 | 6* | 9** | 4 |
Adenoma | 1 | 4 | 1 | 4 | 5 | 3 |
Carcinoma | 0 | 1 | 3 | 1 | 2 | 0 |
Adenoma, Carcinoma Combined | 1 | 5 | 4 | 5 | 7* | 3 |