Expression of p21waf1/cip1 in 20 inverted papillomas
| Basal/parabasal cells | Median cell layer | Surface cells | ||||
|---|---|---|---|---|---|---|
| p21 negative | p21 positive | p21 negative | p21 positive | p21 negative | p21 positive | |
| Columnar epithelium was present in 11 cases, transitional epithelium in 20 cases, and squamous differentiation in 16 specimens. | ||||||
| Columnar epithelium | ||||||
| p53 negative | 5 | 0 | 5 | 0 | 1 | 4 |
| p53 positive | 3 | 3 | 6 | 0 | 0 | 6 |
| Transitional epithelium | ||||||
| p53 negative | 7 | 0 | 7 | 0 | 7 | 0 |
| p53 positive | 3 | 9 | 11 | 1 | 5 | 7 |
| Squamous epithelium | ||||||
| p53 negative | 5 | 0 | 5 | 0 | 5 | 0 |
| p53 positive | 2 | 9 | 11 | 0 | 7 | 4 |