TABLE 1.
American Joint Committee on Cancer (AJCC) 7th and 8th edition staging criteria for ocular surface squamous neoplasiaa (8th edition updates to the 7th edition are bolded)
| Tumour (T) category | Tumour criteria (7th edition) | Tumour criteria (8th edition) |
|---|---|---|
| TX | Primary tumour cannot be assessed | Primary tumour cannot be assessed |
| TO | No evidence of primary tumour | No evidence of primary tumour |
| Tis | Carcinoma in situ; includes dysplasia, collectively referred to as conjunctival intraepithelial neoplasia | Carcinoma in situ; includes dysplasia, collectively referred to as conjunctival intraepithelial neoplasia |
| T1 | Tumour ≤5 mm in greatest dimension | Tumour (≤5 mm in greatest dimension) invades through the conjunctival basement membrane without invasion of adjacent structures (listed in T3) |
| T2 | Tumour >5 mm in greatest dimension, without invasion of adjacent structures (listed in T3) | Tumour (>5 mm in greatest dimension) invades through the conjunctival basement membrane without invasion of adjacent structures (listed in T3) |
| T3 | Tumour invades adjacent structures (excluding the orbit), including cornea, intraocular structures, forniceal conjunctiva, palpebral conjunctiva, tarsal conjunctiva, lacrimal punctum, canaliculi, plica, caruncle, anterior or posterior eyelid lamella, and/or eyelid margin | Tumour invades adjacent structures (excluding the orbit), including cornea, intraocular structures, forniceal conjunctiva, palpebral conjunctiva, tarsal conjunctiva, lacrimal punctum, canaliculi, plica, caruncle, anterior or posterior eyelid lamella, and/or eyelid margin |
| T4 | Tumour invades the orbit with or without further extension | Tumour invades the orbit with or without further extension |