NCIt definition : Stage IIB includes: T1-T2, N1, M0. T1: Tumor less than or equal to 2 cm in greatest
dimension. T2: Tumor greater than 2 cm but less than or equal to 5 cm in greatest
dimension. N1: Tumor involvement of regional lymph node(s). M0: No distant metastasis.
(AJCC 9th ed.);