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stage I oropharynx cancer definition: Cancer that is no larger than 2 centimeters (about 0.75 inch) and is confined to the oropharynx.
Stage I Oropharyngeal Carcinoma definition: Stage I includes: T1, N0, M0. T1: Tumor 2 cm or less in greatest dimension. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 6th ed.)
stage II oropharynx cancer definition: Tumor that is between 2 and 4 centimeters (0.75 and 1.5 inches) and is confined to the oropharynx.
Stage II Oropharyngeal Carcinoma definition: Stage II includes: T2, N0, M0. T2: Tumor more than 2 cm but not more than 4 cm in greatest dimension. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 6th ed.)
stage III oropharynx cancer definition: The tumor is larger than 4 centimeters (about 1.5 inches) in size and may involve a single lymph node on the same side of the neck.
Stage III Oropharyngeal Carcinoma definition: Stage III includes: (T3, N0, M0); (T1, N1, M0); (T2, N1, M0); (T3, N2, M0). T3: Tumor more than 4 cm in greatest dimension. N1: Metastasis in a single ipsilateral lymph node, 3 cm or less in greatest dimension. N2: Metastasis in a single ipsilateral lymph node, more than 3 cm but not more than 6 cm in greatest dimension, or in multiple ipsilateral lymph nodes, none more than 6cm in greatest dimension, or in bilateral or contralateral lymph nodes, none more than 6cm in greatest dimension. M0: No distant metastasis. (AJCC 6th ed.)
Stage 0 Oropharyngeal Carcinoma definition: Stage 0 includes: Tis, N0, M0. Tis: Carcinoma in situ. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 6th ed.) - 2003
stage IV oropharynx cancer definition: The tumor has spread to the hard palate, tongue, or larynx, to nearby lymph nodes, and may have spread to other parts of the body.
Stage IV Oropharyngeal Carcinoma definition: Stage IV includes: IVA (T4a, N0, M0); (T4a, N1, M0); (T1, N2, M0); (T2, N2, M0); (T3, N2, M0); (T4a, N2, M0); IVB (T4b, Any N, M0); IVC (Any T, Any N, M1). T4a: Tumor invades the larynx, deep/extrinsic muscle of tongue, medial pterygoid, hard palate, or mandible. T4b: Tumor invades lateral pterygoid muscle, pterygoid plates lateral nasopharynx, or skull base or encases carotid artery. M1: Distant Metastasis. (AJCC 6th ed.)
 
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