Cervical Cancer: Stages
What does stage of cancer mean?
The stage of a cancer is how much cancer there is and how far it has spread in your
body. Your healthcare provider uses exams and imaging scans to find out the size of
the cancer and where it is. Scans can also show if the cancer has grown into nearby
areas, and if it has spread to other parts of your body. The stage of a cancer is
one of the most important things to know when deciding how to treat the cancer.
Staging can help doctors have an idea about how the cancer may grow, and how certain
kinds of treatment may work. Staging can also help give your doctor an idea of what
kind of outcomes you can expect (prognosis).
How does cervical cancer spread?
Cervical cancer can spread to other parts of the body. It mainly spreads in 2 ways:
It may grow larger and grow into nearby areas, like the vagina, bladder, rectum, or
other tissues near the uterus and vagina.
It may spread to the lymph nodes in the pelvis.
A third type of spread is through the bloodstream. It can then go to parts of the
body that are farther away, like the lung, brain, or bone. This is not as common.
When cervical cancer has spread to another part of the body, it's not a new cancer.
For instance, if it spreads to the vagina, it's not called vaginal cancer. It's still
cervical cancer. This is because cancer is named for the site of the original tumor.
The cancer cells in the vagina look like those in the cervix.
What are the stages of cervical cancer?
The staging system most often used for cervical cancer is from the International Federation
of Gynecology and Obstetrics (FIGO). Roman numerals 0, I, II, III, and IV (0 to 4)
stand for the different stages of the cancer. The higher the number, the more advanced
the cancer is.
This stage is not part of the FIGO system. Stage 0 is also called carcinoma in situ
(CIS). The cancer has grown only in the surface layer of cells lining your cervix.
It's not cancer, but a serious precancer. This means that if it's not treated it may
turn into true cervical cancer.
This cancer has grown deeper into your cervix. It has not spread. Stage I is then
divided into these groups:
Stage IA1. The cancer is very small and can only be seen with a microscope. It's less than 3
millimeters (mm) deep.
Stage IA2. The cancer can only be seen with a microscope. It's between 3 and 5 mm deep.
Stage IB1. The tumor can be seen without a microscope. It's more than 5 mm deep, but not more
than 2 cm in size.
Stage IB2. The tumor can be seen without a microscope. It's between 2 and 4 cm in size.
Stage IB3. The tumor can be seen without a microscope. It's at least 4 cm in size.
The cancer has spread beyond your cervix and uterus. It has not spread to the walls
of your pelvis or to the lower part of your vagina. It has not spread to lymph nodes
or distant parts of your body. Stage II is then divided into these groups:
Stage IIA. The cancer has not spread to the tissues next to the cervix, called the parametria.
Stage IIA1. The cancer is less than 4 cm in size.
Stage IIA2. The cancer is more than 4 cm in size.
Stage IIB. This cancer has spread to the tissues around your vagina and cervix (the parametria).
The cancer has spread to your lower vagina or to the walls of your pelvis, or it may
be causing kidney problems. It might or might not have spread to nearby lymph nodes.
It has not spread to distant parts of your body. Stage III is then divided into these
Stage IIIA. The cancer has spread to the lower part of your vagina. It has not spread to the
wall of your pelvis.
Stage IIIB. The cancer has spread to the wall of your pelvis. It may block urine flow from your
kidneys to your bladder, causing kidney problems (hydronephrosis).
Stage IIIC1. The cancer is any size and has spread to nearby pelvic lymph nodes.
Stage IIIC2. The cancer is any size and has spread to lymph nodes around your aorta.
The cancer has spread to nearby organs, like your bladder, rectum, or to other parts
of your body, like your liver or lungs. Stage IV is then divided into these groups:
Stage IVA. The cancer has spread to nearby organs, like your bladder or rectum, or it's growing
outside your pelvis.
Stage IVB. The cancer has spread to distant organs beyond your pelvis, such as your liver, lungs,
bones, or distant lymph nodes.
Talking with your healthcare provider
Once your cancer is staged, your healthcare provider will talk with you about what
the stage means for your treatment. Make sure to ask any questions or talk about your