Stage II includes: IIA (T2a, N0, M0); IIB (T1, N1, M0), (T2, N1, M0), (T2a, N1, M0); (T2b, N0, M0); (T2b, N0, M0); (T2b, N1, M0). T2: Tumor extends to soft tissues. T2a: Tumor extends to the oropharynx and/or nasal cavity without parapharyngeal extension. T2b: Any tumor with parapharyngeal extension. N1: Unilateral metastasis in lymph node(s), 6 cm or less in greatest dimension, above the supraclavicular fossa. M0: No distant metastasis. (AJCC 6th ed.) [from NCI]