NCIt definition : Stage IIB includes: (T3b, N0, M0); (T4a, N0, M0). T3b: Tumor measuring more than 2.0
and equal to or less than 4.0 mm in thickness. Ulceration status: With ulceration.
T4a: Tumor measuring more than 4.0 mm in thickness. Ulceration status: Without ulceration.
N0: No regional lymph node metastasis detected. Presence of in-transit, satellite,
and/or microsatellite metastases: No. M0: No evidence of distant metastasis. LDH level
is not applicable. (AJCC 8th ed.);