Comparative immunohistochemical findings
| Right conjunctival biopsy | Left conjunctival biopsy | |
|---|---|---|
| − = 5% or less positive cells; + = 6% to 25%; + + = 26% to 50%; + + + = 51% to 75%; + + + + = more than 75%. | ||
| Immunohistochemical marker | ||
| Pankeratin | + + + + | + + + + |
| HPV | + + + + | + + + + |
| P53 | + + + + | − |
| Bcl-2 | − | − |
| MIB-1 | + + + | + + |