The short answer
Ovarian cancer is staged from I to IV based on how far it has spread — from confined to the ovaries, to the pelvis, to the abdomen, to distant sites. Because early symptoms are vague, it is often found at a later stage.
Ovarian cancer is staged from I to IV.
Stage I is confined to the ovaries; stage IV has spread to distant sites.
Stages II and III involve spread within the pelvis and abdomen.
Because symptoms are vague, ovarian cancer is often found at a later stage (54% distant, SEER).
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This page explains the stages of ovarian cancer and what each one means, for patients and families.
What staging tells you
Staging describes how far ovarian cancer has spread at diagnosis. Doctors use a system called FIGO staging, named for the International Federation of Gynecology and Obstetrics. The same system covers cancer of the ovary, the fallopian tube, and the peritoneum. The peritoneum is the thin lining inside the abdomen. Doctors group these three together because they behave alike and are often hard to tell apart at the start.
Tests such as scans, a CA-125 blood test and biopsy help find the stage.
Stage I: confined to the ovaries or tubes
In stage I, cancer is only in one or both ovaries or fallopian tubes. It has not spread beyond them. Doctors break this into three groups:
- IA — cancer in one ovary or tube only, with the outer surface intact.
- IB — cancer in both ovaries or tubes, still with the outer surface intact.
- IC — cancer with a break in the outer surface, or cancer cells found in fluid taken from the abdomen during surgery.
A tumor that ruptured before or during surgery is still staged IC, even if it was fully removed. That detail affects treatment decisions afterward.
Stage II: spread within the pelvis
In stage II, cancer has grown beyond the ovaries or tubes. It has reached other organs still inside the pelvis, such as the uterus, bladder, or rectum. It has not yet reached the lymph nodes or organs outside the pelvis.
Stage III: spread to lymph nodes or the upper abdomen
In stage III, cancer has spread beyond the pelvis to the abdomen or lymph nodes. Doctors divide this further by the size of the deposits in the lining of the abdomen. The NCI cutoff between IIIB and IIIC is 2 centimeters.
Stage IV: spread to distant organs
Stage IV means the cancer has reached distant sites. Doctors split this into two groups. IVA means cancer cells are found in fluid around the lungs. IVB means the cancer has spread to organs and tissues outside the abdomen. Ask your team what treatment aims to do at your stage.
Why stage is not the whole picture
Stage tells you how far the cancer has spread. It does not tell you exactly how the cancer will behave in your body. Two other things matter alongside it. Grade describes how abnormal the cancer cells look under a microscope, which relates to how fast they tend to grow. The specific cell type can matter too. Ask your team how these apply to you.
NCI SEER data show five-year relative survival of about 92% when ovarian cancer is localized. It is about 70% for regional spread and about 32% for distant spread. About 54% of cases are found at the distant stage. These numbers cover people diagnosed from 2016 to 2022. They describe a group, not you. Your age, overall health and response to treatment also matter.
What to ask your team
- What stage and grade is my cancer, and what specifically defines that stage?
- How much cancer was found during my surgery or tests?
- Does my pathology report mention the cell type, and does that change my treatment?
- What does my stage mean for the treatment plan you are recommending?
- How will you monitor for recurrence after treatment?
Sources
Common questions
How is ovarian cancer staged?
It uses stages I to IV, based on how far the cancer has spread: confined to the ovaries (I), spread within the pelvis (II), spread to the abdomen or nearby lymph nodes (III), or spread to distant sites (IV).
Why is it often found late?
Because early symptoms are vague and there is no screening test recommended for average-risk women, ovarian cancer is often found late. SEER reports 54% of cases are found at the distant stage.
How is the stage determined?
Tests such as imaging, a CA-125 blood test and biopsy help determine the stage.
Why does the stage matter?
The stage guides treatment and gives a general sense of the outlook.
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Last updated: 2026-10-02Next planned review: 2027-07-07
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Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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