Stage II includes: IIA: (T2/T3, pN0, M0), IIB: (T2/T3, cN0, M0), and IIC: (T4, N0, M0). T2: Primary tumor greater than 2 cm but not more than 5 cm in maximum dimension. T3: Primary tumor over 5 cm in maximum dimension. T4: Primary tumor invades bone, muscle, fascia, or cartilage. pN0: No regional lymph node metastasis by pathologic examination. cN0: No regional lymph node metastasis by clinical examination. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 7th Ed.) [from NCI]