Preferred Label : Stage I Endometrial Cancer FIGO 2023;
NCIt synonyms : Stage I Endometrial Carcinoma FIGO 2023;
NCIt definition : FIGO stage I includes: 1A1: non-aggressive histological type of endometrial carcinoma
limited to a polyp or confined to the endometrium; 1A2: non-aggressive histological
type of endometrial carcinoma involving less than 50% of the myometrium with no or
focal lymphovascular space invasion (LVSI) as defined by WHO criteria; 1A3: low-grade
endometrioid carcinoma limited to the uterus with simultaneous low-grade endometrioid
ovarian involvement; IB: non-aggressive histological type of endometrial carcinoma
involving 50% or more of the myometrium with no LVSI or focal LVSI; and IC: aggressive
histological type of endometrial carcinoma, i.e. serous, high-grade endometrioid,
clear cell, carcinosarcoma, undifferentiated, mixed, and other unusual types without
any myometrial invasion. (FIGO 2023);