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Table 1 TNM staging system for oral cavity

From: Treatment improvement and better patient care: which is the most important one in oral cavity cancer?

Primary tumor (T)  
T1 Tumor ≤2 cm in greatest dimension
T2 Tumor >2 cm and ≤4 cm in greatest dimension
T3 Tumor >4 cm in greatest dimension
T4a Moderately advanced local disease. Tumor invades adjacent structures only (through cortical bone [mandible or maxilla], into deep [extrinsic] muscle of tongue, maxillary sinus, skin of face)
T4b Very advanced local disease. Tumor invades masticator space, pterygoid plates, or skull base and/or encases internal carotid artery
Regional Lymph Nodes (N)  
N1 Metastasis in a single ipsilateral lymph-node, ≤3 cm in greatest dimension
N2a Metastasis in a single ipsilateral lymph-node, >3 cm and ≤6 cm in greatest dimension
N2b Metastasis in multiple ipsilateral lymph-nodes, none >6 cm in greatest dimension
N2c Metastasis in bilateral or controlateral lymph-nodes, none >6 cm in greatest dimension
N3 Metastasis in lymph-nodes >6 cm in greatest dimension
Distant metastasis (M)  
M1 Distant metastasis