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Incidence of obvious epithelial type II cell hyperplasia, lung tumors, and malignant pleural mesothelioma
| Group | Hyperplasia | Lung tumors | Malignant mesothelioma | Total tumor burden (%) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Number of rats | Number of rats | Incidence (%) | Adenoma | Adenocarcinoma | Combined | Incidence (%) | Number of rats | Incidence (%) | ||
| Vehicle | 15 | 1 | 7 | 0 | 1 | 1 | 7 | 0 | 0 | 7 |
| MWCNT‐7 | 19 | 17** | 89** | 1 | 0 | 1 | 5 | 18** | 95** | 95** |
| Crocidolite | 19 | 8* | 42* | 4 | 1 | 5 | 26 | 0 | 0 | 26 |
*,**Significantly different from the vehicle group at P < 0.05, P < 0.001.
