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Cervical Cancer Staging: FIGO Classification System

Cervical cancer staging helps to determine the disease prognosis and to select an appropriate treatment strategy.

FIGO (International Federation of Gynecology and Obstetrics) is the most commonly used staging systems for cervical cancer.

Following table describes the characteristics of cervical cancer according to different stages:

FIGO STAGE DESCRIPTION
I The primary tumor has invaded into deeper cervical layer but is present only in the Uterus. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IA The cancer cells are visible only under a microscope. Cervical stromal invasion </=5.0 mm in depth and horizontal epithelium invasion </=7.0 mm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IA1 The cancer cells are visible only under a microscope. Cervical stromal invasion </=3.0 mm in depth and horizontal epithelium invasion </=7.0 mm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IA2 The cancer cells are visible only under a microscope. Cervical stromal invasion >3.0 mm but </=5.0 mm in depth and horizontal epithelium invasion </=7.0 mm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IB The cancer cells are visible without a microscope or those visible only under a microscope but tumor size larger than T1a2. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IB1 The cancer cells are visible without a microscope and tumor size </=4.0 cm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IB2 The cancer cells are visible without a microscope and tumor size >4.0 cm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
II The cancer cells have invaded beyond the cervix and the uterus but haven’t spread to the pelvic wall or to the lower part of the vagina. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIA The cancer cells have invaded beyond the cervix and the uterus but haven’t spread to the parametria (tissue next to the cervix). It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIA1 The cancer cells have invaded beyond the cervix and the uterus but haven’t spread to the parametria and tumor size </=4.0 cm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIA2 The cancer cells have invaded beyond the cervix and the uterus but haven’t spread to the parametria and tumor size >4.0 cm. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIB The cancer cells have spread to the parametria. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
III The cancer cells have spread to the pelvic wall or to the lower part of the vagina. It may block the ureter causing hydronephrosis. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIIA The cancer cells have spread to the lower part of the vagina. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IIIB The cancer cells have spread to the pelvic wall. It may have blockage the ureter causing hydronephrosis. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IVA The cancer cells have invaded beyond the pelvis wall into the bladder or the rectum. It might or might not have spread to nearby lymph nodes without any spread to distant body parts.
IVB The cancer cells have spread to distant body parts such as distant lymph nodes, lungs, bones, or liver.
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