In English | En español
Questions About Cancer? 1-800-4-CANCER

Cervical Cancer Treatment (PDQ®)

  • Updated: 10/23/2014

Table 1. Definitions of FIGO Stage Ia

Stage Description Illustration 
IThe carcinoma is strictly confined to the cervix (extension to the corpus would be disregarded).
IAInvasive carcinoma, which can be diagnosed only by microscopy with deepest invasion ≤5 mm and largest extension ≥7 mm.
IA1Measured stromal invasion of ≤3.0 mm in depth and extension of ≤7.0 mm.
IA2Measured stromal invasion of >3.0 mm and ≤5.0 mm with an extension of ≤7.0 mm.
IBClinically visible lesions limited to the cervix uteri or preclinical cancers greater than stage IAb.
IB1Clinically visible lesion ≤4.0 cm in greatest dimension.
IB2Clinically visible lesion >4.0 cm in greatest dimension.

FIGO = Féderation Internationale de Gynécologie et d’Obstétrique.
aAdapted from FIGO committee on gynecologic oncology.[3]
bAll macroscopically visible lesions - even with superficial invasion - are allotted to stage IB carcinomas. Invasion is limited to a measured stromal invasion with a maximal depth of 5.00 mm and a horizontal extension of ≤7.00 mm. Depth of invasion should be ≤5.00 mm taken from the base of the epithelium of the original tissue - superficial or glandular. The depth of invasion should always be reported in mm, even in those cases with "early (minimal) stromal invasion" (~1 mm). The involvement of vascular/lymphatic spaces should not change the stage allotment.


  1. Pecorelli S: Revised FIGO staging for carcinoma of the vulva, cervix, and endometrium. Int J Gynaecol Obstet 105 (2): 103-4, 2009.  [PUBMED Abstract]