<prompt> Tumour in cheek with 3 cm size with contralateral mobile lymph nodes comes under:T3N2M0T2N2M0T4N2M0T3N3M0  <response>: b T2 N2 M0 Ref. Cummings, 6th ed., 1369AJC Staging of Oral Cavity CarcinomaT1 Tumours 2cm and 5mm depth of invasionT2 Tumours 2cm and up till 4cm and 10mm depth or Tumours 2cm and 5, 10mm depth of invasionT3 Tumours 4cm or 10mm depth of invasionT4a Locally advanced disease tumour may involve mandible, hard palate, muscles of tongue, maxillary sinus, skin of face, medial pterygoid muscleT4b Very advanced disease, tumour invades lateral pterygoid muscle, pterygoid plates, masticator space, skull base and or internal carotid artery N0 No cervical lymph nodesN1 Single ipsilateral node 3cm without Extra Nodal Extension ENE-veN2 Single ipsilateral node 3-6cm N2a , multiple ipsilateral N2b , contralateral or bilateral nodes N2c , 6cm. All without Extra Nodal ExtensionN3a Single or multiple nodes 6cm without Extra Nodal ExtensionN3b Single or multiple nodes with Extra Nodal Extension ENEM0 No metastasisM1 Distant metastatis 