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Associations between histologic diagnosis, keratinous layer and pink-color sign
| HGIN or invasive cancer | LGIN | P value | |
| Pink-color-sign | 0.0001 | ||
| Positive | 26 | 2 | |
| Negative | 14 | 19 | |
| Keratinous layer | 0.0007 | ||
| Present | 19 | 20 | |
| Absent | 21 | 1 |
HGIN: High-grade intraepithelial neoplasia; LGIN: Low-grade intraepithelial neoplasia.
