NCIt definition : Stage IB includes: T1b, N0, M0. T1b: Tumor with measured deepest invasion more than
5 mm (greater than FIGO stage IA); lesion limited to the cervix uteri with size measured
by maximum tumor diameter. Note: The involvement of vascular/lymphatic spaces should
not change the staging. The lateral extent of the lesion is no longer considered.
N0: No regional lymph node metastasis. M0: No distant metastasis. (from AJCC 9th Ed.);