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.
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The full explanation.
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 current version lines up with the AJCC staging manual used since 2018. 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. They are often hard to tell apart at the start.
Staging usually happens during surgery, not just imaging. A surgeon examines the pelvis and abdomen directly. Tissue samples are taken and checked. That is different from many other cancers, where a scan alone can set 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. This stage is less common than I or III. Ovarian cancer often skips straight to stage III once it starts spreading.
Stage III: spread to lymph nodes or the upper abdomen
Stage III is the stage where most ovarian cancer is found. It means the cancer has reached lymph nodes behind the abdomen, called retroperitoneal nodes. It can also mean the cancer has spread to the lining of the upper abdomen, outside the pelvis. Doctors divide this further by how much cancer is found and how large the deposits are. The cutoff is about 2 centimeters, roughly the width of a large coin. Larger, more widespread deposits generally mean more extensive surgery and chemotherapy.
Stage IV: spread to distant organs
Stage IV means the cancer has reached distant sites. That can include fluid around the lungs, the inside of the liver or spleen, distant lymph nodes, or other organs outside the abdomen. Doctors split this into two groups. IVA means cancer cells are found only in fluid around the lungs. IVB means the cancer has reached organs like the liver, or distant lymph nodes. Stage IV is still treated, often effectively for a period of time. It is usually not curable.
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 matters too. High-grade serous carcinoma, the most common type, behaves differently than clear cell or mucinous ovarian cancer. How much cancer a surgeon can remove during debulking surgery also affects outlook, often as much as stage does.
National data shows five-year relative survival around 92% when ovarian cancer is found localized, before it has spread. That drops to about 70% once it has reached regional lymph nodes. It drops further, to about 32%, for cancer found after it has spread to distant sites. These numbers come from thousands of people diagnosed between 2016 and 2022. They describe a group, not you. Your age and overall health matter. So does how completely surgery removes the cancer, and how your specific tumor responds to chemotherapy. A stage number alone cannot capture any of that.
What to ask your team
- What stage and grade is my cancer, and what specifically defines that stage?
- How much cancer was found or removed during my surgery?
- 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
Words to know
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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 reliable screening test for average-risk women, ovarian cancer is often found at stage III or later, after it has spread within the abdomen.
How is the stage determined?
The stage is usually determined during surgery, when the surgeon can see how far the cancer has spread and take samples, along with imaging.
Why does the stage matter?
The stage guides how much surgery and chemotherapy are needed and gives a general sense of the outlook.
Questions to ask your doctor
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Last updated: 2026-08-17Next planned review: 2027-07-07
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How this page was created
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. We do not employ clinicians and do not intend to — our work 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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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