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. 2021 Jan 4;9:e10619. doi: 10.7717/peerj.10619

Table 1. Histological changes in rat tongue by 4NQO treatment.

Group
(week)
No. of normal Mild epithelial dysplasia Moderate epithelial dysplasia Severe
epithelial
dysplasia
No. of SCC Incidence
(%)
control 5 0 0 0 0 0
9week 0 4 3 0 0 0
13week 0 1 5 1 0 0
20week 0 0 5 0 0 0
24week 0 0 0 2 4 33.3
32week 0 0 0 0 8 100