Percentage distribution of p16Ink4a immunohistochemical staining in tissue material: NSGT, PA (including division into ‘slow’ and ‘fast’ subsets) and CaexPA
| p16Ink4a expression | Normal | All PA | ‘Slow’ PA | ‘Fast’ PA | CaexPA | All PA and CaexPA |
| Positive | 0 (0.00%) | 68 (74.73%) | 32 (47.06%) | 36 (52.94%) | 23 (25.27%) | 91 |
| Borderline | 0 (0.00%) | 80 (80.00%) | 20 (25.00%) | 60 (75.00%) | 20 (20.00%) | 100 |
| No expression | 22 (84.62%) | 0 (0.00%) | 0 (0.00%) | 0 (0.00%) | 4 (15.38%) | 26 |
| Total | 22 | 148 | 52 | 96 | 47 | 217 |
CaexPA, carcinoma ex pleomorphic adenoma; NSGT, normal salivary gland tissue; PA, pleomorphic adenoma.