Stage 1 ovarian cancer

The stage of a cancer tells the doctor how big it is and if it has spread. The tests and scans you have to diagnose your cancer will give some information about the stage. But your doctor might not be able to tell you the exact stage until you have surgery.

Doctors use the International Federation of Gynecology and Obstetrics (FIGO) staging system to stage cancers in the:  

  • ovaries 
  • fallopian tubes
  • peritoneum

There are four stages, numbered 1 to 4. 

Stage 1 ovarian cancer means the cancer is only in the ovaries. It is classed as early ovarian cancer. Surgery is the main treatment. Some women also need chemotherapy.

What is stage 1 ovarian cancer?

Stage 1 ovarian cancer is only in the ovaries. It is divided into 3 groups:

Stage 1A means the cancer is completely inside one ovary or fallopian tube

Stage 1B means the cancer is completely inside both ovaries or fallopian tubes

Stage 1C is split in to 3 groups:

  • stage 1C1 means the cancer is in one or both ovaries or fallopian tubes. The ovary ruptures (bursts) during surgery
  • stage 1C2 means the cancer is in one or both ovaries or fallopian tubes. The ovary ruptures (bursts) before surgery or there is some cancer on the surface of an ovary or fallopian tube
  • stage 1C3 means the cancer is in one or both ovaries or fallopian tubes. There are cancer cells in fluid taken from inside your abdomen during surgery
Diagram showing stage 1 ovarian cancer

Treating stage 1 ovarian cancer

The main treatment is surgery. Some women need chemotherapy.

Your healthcare team consider several factors when deciding what type of treatment you need. These factors include;

  • whether you have stage 1A, 1B or 1C ovarian cancer
  • the grade of your cancer  
  • the type of cells the cancer started in
  • your age and whether you want any more children
  • other health conditions you have

Surgery

Surgery for early ovarian cancer aims to remove your cancer and find out how far it has spread. The specialist surgeon (gynaecologist) usually removes your:

  • ovaries
  • fallopian tubes
  • womb (including the cervix)

During the operation, the gynaecologist examines the inside of your abdomen and your abdominal organs for signs of cancer. You might need further surgery if your cancer has spread.

Having children in the future

For some low grade stage 1A cancers, it might be possible to only remove the affected ovary and fallopian tube. The unaffected ovary and your womb are not removed. This means you might be able to become pregnant and have a baby afterwards. 

Chemotherapy

After surgery, your doctor might suggest you have chemotherapy. This depends on:

  • your type of cancer
  • the grade of your cancer

This is called adjuvant chemotherapy and aims to lower the risk of your cancer coming back.

About other stages

  • Cancer of the ovary, fallopian tube, and peritoneum: 2021 update
    JS Berek and others
    International Journal of Gynecology and Obstetrics, 2021. Volume 155. Pages 61-85

  • British Gynaecological Cancer Society (BGCS) ovarian, tubal and primary peritoneal cancer guidelines: Recommendations for practice update 2024
    E Moss and others
    European Journal of Obstetrics & Gynecology and Reproductive Biology, 2024. Volume 300. Pages 69-123

  • The recognition and initial management of ovarian cancer
    National Institute for Health and Care Excellence (NICE), April 2011 (updated 2023)

  • Newly diagnosed and relapsed epithelial ovarian carcinoma: ESMO clinical practice guideline for diagnosis, treatment and follow up
    A Gonzalez-Martin and others
    Annals of oncology, 2023. Volume 34. Pages 833 – 848

  • Non-epithelial ovarian cancer: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-up
    I Ray-Coquard and others
    Annals of Oncology, 2018, Volume 29. Pages iv1-iv18

  • The information on this page is based on literature searches and specialist checking. We used many references and there are too many to list here. Please contact patientinformation@cancer.org.uk if you would like to see the full list of references we used for this information.

Last reviewed: 
28 Nov 2024
Next review due: 
29 Nov 2027

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