Table 1 World health organization (WHO) TNM (tumor, node, metastasis) classification system for feline epidermal origin tumors8.

From: Efficacy of gabapentin as pain management of T2–T4 feline facial squamous cell carcinoma treated with electrochemotherapy

Tumor

 

T0

No evidence of tumor

Tis

Pre-invasive carcinoma (in situ)

T1

Tumor < 2 cm maximum diameter, superficial or exophytic

T2

Tumor 2–5 cm maximum diameter, or with minimal invasion irrespective of size

T3

Tumor > 5 cm maximum diameter, or with invasion of the subcutis irrespective of size

T4

Tumor invading other structures such as the fascia, muscle, bone or cartilage

Node

N0

No evidence of regional node involvement

N1

Evidence of regional node involvement

Metastasis

M0

No evidence of distant metastasis

M1

Evidence of distant metastasis

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