From: Comparative carcinogenicity study of a thick, straight-type and a thin, tangled-type multi-walled carbon nanotube administered by intra-tracheal instillation in the rat
Treatment
Group
Number of rats examined
Number of rats with bronchiolo-alveolar
hyperplasia
Vehicle
5
0
MWCNT-A (0.5 mg)
3
MWCNT-A (1.0 mg)
5**
MWCNT-B (0.5 mg)
MWCNT-B (1.0 mg)
Crocidolite