Table 2.
Histopathological features of medium-sized and large melanomas in current study and the COMS.a
| Histopathological features | Medium-sized tumor |
Large tumor |
||
|---|---|---|---|---|
| Current study (%) | The COMS (%) | Current study (%) | The COMS (%) | |
| Cell type | ||||
| Mixed cell type | 0 | 84.7 | 30 | 86.7 |
| Spindle cell type | 93 | 12.3 | 55 | 7.2 |
| Epitheloid cell type | 7 | 3 | 15 | 6.1 |
| Neovascularization of the iris | 10 | 2 | 15 | 8 |
| Optic nerve invasion | 0 | 0 | 0 | 7 |
| Extrascleral extension | 5 | 3 | 10 | 8 |
a
Histopathological features of medium-sized and large melanomas in the COMS were taken from Collaborative Ocular Melanoma Study Group (1998a).