Solid tumors
Ovarian germ cell tumor
If you or someone you love has just heard this diagnosis, start here. This guide explains what the condition is, how it is usually treated and where a transplant fits.
Malignant ovarian germ cell tumors are rare cancers that start in the egg-making cells of the ovary. They mostly affect teens and young women and are usually cured with surgery that aims to save fertility, often followed by chemotherapy. A transplant is rarely part of care. When high-dose chemotherapy is used for a tumor that comes back, the person’s own stem cells are returned, so no donor is needed.
Other names and abbreviations
ovarian GCT, OGCT, ovarian dysgerminoma, ovarian nongerminomatous germ cell tumor, Malignant ovarian germ cell tumour, ovarian germ-cell cancer
In short
- Ovarian germ cell tumors start in the ovary cells that normally become eggs. They mostly affect teens and young adults and differ from more common ovarian cancers.
- Treatment uses surgery, saving fertility when possible, and platinum-based chemotherapy when needed. The plan is guided by tumor type, stage, tumor markers and response.
- For some tumors that come back, high-dose chemotherapy may be considered, often in specialist or research care. The patient's own stem cells are then returned, so no donor is needed.
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Underlined words open a short explanation. See all terms
Where transplant fits
High-dose chemotherapyVery strong drug treatment given in large doses, often to kill cancer cells. It also destroys the bone marrow and can cause other serious side effects. A stem cell transplant usually follows to rebuild the marrow. with autologous stem cell rescueComing from the patient's own body. In an autologous transplant, the patient's own stem cells are collected and stored, then given back after high-dose treatment. It does not use a donor. may be considered for selected recurrent disease, often in a specialist or research setting. Evidence is limited and partly drawn from broader germ-cell tumor experience. The procedure uses the patient’s cells, not a registry donor.
Treatment depends on the exact diagnosis, disease stage, prior treatment and the person’s health.
Key facts
- Who it affects
- Ovarian germ-cell tumors mainly affect teenagers and young adults.
- How common
- About 0.4 new cases per 100,000 people a year; about 5 in every 100 ovarian cancersEuropean age-standardized rate for malignant ovarian germ cell tumors, Netherlands Cancer Registry, 1989–2015; share of ovarian cancers from a 2025 review Source: How common
- Cells used in a transplant
- The patient’s own collected blood-forming cells for autologous stem cell rescue, when that procedure is appropriate.
- Where a donor fits
- Usually the person’s own cells
The condition
What it is
Germ cells are the cells that develop into eggs or sperm. An ovarian germ cell tumor starts in these cells in the ovary. Most ovarian germ cell tumors are not cancer: they are mature teratomas, also called dermoid cysts. This guide is about the malignant (cancerous) types.
The main malignant types are dysgerminoma, the most common, and the non-dysgerminoma group: yolk sac tumor, immature teratoma, embryonal carcinoma, choriocarcinoma and mixed germ cell tumors. The type matters, because it changes the treatment plan and the outlook.
These cancers are different from the far more common epithelial ovarian cancers. Malignant germ cell tumors make up about 5 in every 100 ovarian cancers. They usually occur in teenage girls and young women, most often affect just one ovary, and tend to grow quickly.
What causes it
The exact cause is not known. Researchers think gene changes in developing germ cells, perhaps together with outside factors such as hormones before birth, play a part. A common finding in the tumor cells is extra copies of part of chromosome 12 (12p). Changes in genes such as KIT and KRAS are also found.
Some differences in sex development raise the risk. One example is gonadal dysgenesis, where the ovaries or testes do not form in the usual way. The risk is higher when these gonads contain Y-chromosome material. For high-risk conditions such as Swyer syndrome and Turner syndrome, a 2025 review says removing the gonads before a tumor forms may be reasonable.
These tumors are very rare in young girls. The number of cases starts to rise at about age 8 or 9. The malignant types are most common in women under 30.
Symptoms and effects
Because these tumors grow fast, they often cause symptoms early. Common signs are belly pain, a lump that can be felt in the lower belly, and a swollen belly. The tumor can also twist the ovary (torsion) or break open, which causes sudden, severe belly pain.
Some tumors release hormones or proteins into the blood. Choriocarcinoma and embryonal carcinoma can make hCG, the pregnancy hormone. With embryonal carcinoma, this can cause unexpected bleeding from the uterus. Yolk sac tumors make alpha-fetoprotein (AFP). These tumor markers help with diagnosis and follow-up.
About 60 to 70 in every 100 are found at an early stage, while still in the ovary. Others have spread within the pelvis or belly, to lymph nodes, or beyond the belly. Choriocarcinoma, for example, often spreads to the lungs and liver.
A simple drawing of a body. Often affected: ovaries. Can also be affected: airway and lungs, liver and lymph nodes.
Often affected
- Ovaries: most often just one ovary
Can also be affected
- Airway and lungs: for example with choriocarcinoma
- Liver: for example with choriocarcinoma
- Lymph nodes
This shows the parts of the body the condition can affect. Most people have only some of these, and the drawing says nothing about how severe any of them will be.
Diagnosis and treatment
How ovarian germ cell tumors are diagnosed
Many are found because of belly pain, a swollen belly or a lump in the lower belly. Some are found during a routine pelvic exam. Imaging usually starts with an ultrasound of the pelvis, often followed by an MRI or CT scan. A 2025 review says MRI is preferred where possible, because it gives a clearer picture and avoids radiation.
Blood tests look for tumor markers. A raised alpha-fetoprotein (AFP) points toward a yolk sac tumor or some other types. A raised hCG can come from choriocarcinoma, embryonal carcinoma, mixed tumors and some dysgerminomas. LDH is often raised with dysgerminoma. The same markers are checked again after surgery and during chemotherapy, because a level that stays high can mean some tumor is left.
The diagnosis is confirmed when the tumor is removed and a lab doctor (pathologist) examines it. During the operation, the surgeon looks over the belly and pelvis and may take tissue samples and fluid washings to learn the stage. Doctors use the FIGO staging system, from stage I (only in the ovary) to stage IV (spread beyond the belly). Expert review of the tissue matters. In one North American study of children and teens, the quick test done during surgery (frozen section) was wrong in 23 of 60 patients.
Some differences in sex development raise the risk of these tumors. So for girls who have not yet had their first period, a 2025 review says a chromosome test (karyotype) is ideally done before surgery.
How it is treated
Surgery comes first. Because most patients are young, the usual operation removes only the affected ovary and its fallopian tube. It keeps the uterus and the other ovary, so that pregnancy may still be possible. The surgeon also checks the belly and takes samples to find the stage.
What happens next depends on the type and stage. Stage IA dysgerminoma and fully staged stage IA grade 1 immature teratoma are often treated with surgery alone and close follow-up. Most other types and stages get chemotherapy after surgery. The standard combination for teens and young women is BEP: bleomycin, etoposide and cisplatin, often for 3 or 4 cycles. Younger children may get similar combinations, sometimes with carboplatin instead of cisplatin. Radiation is rarely used today, because it can end fertility.
If the cancer comes back, care teams usually give a different platinum-based chemotherapy, such as a combination with ifosfamide, sometimes with paclitaxel. Surgery can help in selected cases. For cancer that keeps coming back or stops responding to platinum, high-dose chemotherapy followed by a return of the person’s own stem cells may be used. European transplantA treatment that gives a patient healthy blood-forming stem cells through a vein. The cells travel to the bone marrow and replace faulty marrow or marrow damaged by treatment. They can come from the patient or a donor. experts (EBMT, 2025) call this a standard option for adults in two cases. One is germ cell tumors that do not respond to platinum. The other is tumors that come back a second time. NCI’s summary for ovarian germ cell tumors lists it as a treatment studied in clinical trialsA research study that tests how well a new medical approach works in people. Trials can test new ways to screen for, prevent, diagnose or treat a disease..
Evidence for high-dose chemotherapy in women is limited. An EBMT registry study looked at 60 women and girls aged 15 to 48, treated from 1985 to 2013. Of these, 40 had tumors that started in the ovary. After a median follow-up of 87 months, 25 of the 60 (42%) were free of cancer growth. Three died from treatment side effects. Most larger studies involved men with testicular cancer. A large trial comparing standard and high-dose chemotherapy at first relapse, called TIGER, included only males.
Kinds of treatment described for ovarian germ cell tumor: watching and regular checks, medicines, surgery or radiation and a transplant with the person’s own cells (for a few people).
After diagnosis, the options described here
Watching and regular checks
Some early tumors of certain types are treated with surgery alone and then close follow-up.
Medicines
Most other types and stages get chemotherapy after surgery.
Surgery or radiation
Surgery usually removes only the affected ovary and tube, so pregnancy may still be possible, and radiation is rarely used today.
Transplant with the person’s own cells, For a few people
When high-dose chemotherapy is used for a tumor that comes back, the person’s own stem cells are returned afterward.
What a transplant involves
These are the kinds of treatment this page describes, not a plan. Which ones fit, in what order and whether they are combined differs from person to person.
What a transplant involves
- Step 1
: Collecting the person’s own cells
Medicines move stem cells out of the marrow and into the blood. The cells are then collected and frozen.
- Step 2
: High-dose treatment
The person receives strong treatment, usually high-dose chemotherapy.
- Step 3
: Cells returned, Day 0
The stored cells are thawed and given back through a vein, like a transfusion.
- Step 4
: Blood counts recover
The returned cells settle in the marrow and start making blood cells again.
- Step 5
: Follow-up
The care team keeps checking recovery and watches for infection and for the condition coming back.
Daily life and the donor’s role
Living with the condition and treatment
Chemotherapy can cause short-term problems such as low blood counts, nerve damage, hearing loss and kidney problems. Bleomycin can harm the lungs, so it is usually stopped after 3 cycles. Later effects can include heart disease, high blood pressure, changes in ovary function and second cancers. Because many patients are young, these long-term effects are watched for years, and second cancers are a particular concern.
Fertility is a central concern. With surgery that keeps one ovary and the uterus, most patients keep their periods and the chance to become pregnant. A 2025 review reports an infertility rate of 5 to 10 in every 100 after treatment, similar to the general population. Pregnancy was less likely after more than 3 cycles of chemotherapy.
Follow-up is close, especially early on. About 3 in 4 relapses happen in the first 2 years. Checkups include exams, tumor marker blood tests and imaging. The review describes follow-up lasting up to 10 years, with visits spaced further apart over time.
The role of a blood stem cell donor
No donor is involved in treating ovarian germ cell tumors. Most people are treated with surgery and chemotherapy and never have a transplant.
Sometimes high-dose chemotherapy is used for a tumor that comes back. It is followed by an autologous stem cell transplant. This uses the person’s own stem cells, collected and frozen beforehand. The returned cells rebuild the blood after the high doses. European transplant experts (EBMT, 2025) list donor (allogeneicComing from another person. In an allogeneic, or donor, transplant, the stem cells come from a relative or an unrelated volunteer whose cells are a close enough match to the patient's.) transplant as generally not recommended for children and teens with germ cell tumors. They do not list it as an option for adults.
Joining a donor registry helps other patients, such as people with leukemia, but it is not part of treatment for this cancer.
Highlighted here: the person’s own cells.
The person’s own cells
Autologous transplant, no donor
Collected from the person before treatment, then given back.
A relative
Donor transplant (allogeneic)
A brother or sister may be a full match. Parents and children can be half-matched donors.
An unrelated volunteer
Donor transplant (allogeneic)
Found through a donor registry.
Donated cord blood
Donor transplant (allogeneic)
Collected from a baby’s umbilical cord after birth and stored in a public bank.
Looking ahead
Looking ahead
Outlook for ovarian germ cell tumors
NCI says ovarian germ cell tumors are usually cured if found and treated early. Most are found at an early stage, and combination chemotherapy after surgery has greatly improved survival over the past 40 years.
Outlook depends on the stage, the tumor type, whether all the tumor could be removed, and age. An Italian study published in 2011 found 5-year survival of 100% for immature teratoma and 97.9% for dysgerminoma. It was 69.6% for yolk sac tumor and 62.9% for mixed germ cell tumors. Women diagnosed after age 45 did less well.
If the cancer comes back, cure is still possible, but it is harder. About 3 in 4 relapsesWhen a disease comes back after a period of getting better. Relapsed disease has returned after treatment helped for a time. happen within 2 years. About half of people with germ cell tumors respond to second-line chemotherapy. An EBMT study looked at 60 women and girls given high-dose chemotherapy with their own stem cellsYoung cells that can grow into every type of blood cell: red cells that carry oxygen, white cells that fight infection and platelets that help blood clot. They are found in the bone marrow and the bloodstream.. After a median of 87 months, 42% were free of cancer growth.
About these numbers. Each one says which group of people it comes from, and the place and years where the source gives them. It describes what happened across that group, not what will happen to any one person. And a figure measured among people who had a transplant is not the same as the number of people who need one.
- 88%5-year overall survival, all stages
Women diagnosed with malignant ovarian germ cell tumors in the Netherlands, most recent period up to 2015 (up from 73% in the late 1980s), Netherlands Cancer Registry
Read the source: 5-year overall survival, all stages - 91%5-year overall survival, stage I
Women with malignant ovarian germ cell tumors, Netherlands Cancer Registry, diagnosed 1989–2015, as reported in a 2025 review
Read the source: 5-year overall survival, stage I - 59%5-year overall survival, stage IV
Women with malignant ovarian germ cell tumors, Netherlands Cancer Registry, diagnosed 1989–2015, as reported in a 2025 review
Read the source: 5-year overall survival, stage IV
These figures describe groups of people treated in past years, mainly in the Netherlands, Italy and Europe-wide registries. They cannot predict how any one person will do.
Common questions
Is an ovarian germ cell tumor cancer?
Not always. Most ovarian germ cell tumors are mature teratomas, also called dermoid cysts, which are not cancer. The malignant types include dysgerminoma, yolk sac tumor, immature teratoma, embryonal carcinoma, choriocarcinoma and mixed germ cell tumors. This guide is about those malignant types. The pathology report from surgery gives the exact type, which guides treatment.
Is it the same as ovarian cancer?
It is a type of ovarian cancer, but it is different from the common kind. Most ovarian cancers are epithelial. Malignant germ cell tumors make up about 5 in every 100 ovarian cancers. They mostly affect teens and young women and usually grow in one ovary. They respond very well to platinum-based chemotherapy. Their treatment and outlook are different.
Can I still have children after treatment?
Often, yes. The usual surgery removes only the affected ovary and tube and keeps the uterus and the other ovary. With this approach, most patients keep their periods and fertility. A 2025 review reports an infertility rate of 5 to 10 in every 100 after treatment, similar to the general population. Pregnancy was less likely after more than 3 cycles of chemotherapy. The review adds that patients are usually advised not to become pregnant in the first 2 years after diagnosis.
Is an ovarian germ cell tumor curable?
Usually. NCI says these tumors are usually cured if found and treated early, and most are found early. In the Netherlands, 88% of women diagnosed in the most recent period up to 2015 were alive 5 years later. Outlook is lower for stage IV disease and for some types, such as yolk sac tumor. Group figures cannot predict what will happen to one person.
Does it need a bone marrow donor?
No. Most people are treated with surgery and chemotherapy alone. If high-dose chemotherapy is used for a tumor that comes back, it is followed by a return of the person’s own stem cells, collected beforehand. European transplant experts list donor transplants as generally not recommended for children and teens with these tumors, and do not list them for adults. So no donor search is needed.
What are AFP, hCG and LDH?
They are tumor markers: substances some germ cell tumors release into the blood. Alpha-fetoprotein (AFP) is often raised with yolk sac tumors. Human chorionic gonadotropin (hCG), the pregnancy hormone, is made by choriocarcinoma, embryonal carcinoma and some dysgerminomas. Lactate dehydrogenase (LDH) is often raised with dysgerminoma. Doctors check them at diagnosis, during treatment and at follow-up to watch for any tumor left or coming back.
For your next appointment
Ovarian germ cell tumor
From the Jada Bascom Foundation disease library, jadabascomfoundation.org. Printed .
Questions to bring to your care team
- Which type of germ cell tumor is it, and what stage? Has an expert pathologist reviewed the tissue?
- Was the surgery a full staging surgery, and does that change whether chemotherapy is needed or close follow-up is enough?
- How might this treatment affect my periods and fertility, and should I see a fertility specialist before chemotherapy starts?
- Which tumor markers will you follow, and how often? If the cancer comes back, would high-dose chemotherapy with my own stem cells be considered, and at which center?
- What is the goal of each treatment you are suggesting?
- How does a transplant compare with the other treatments on offer?
- Where can our family find support during treatment?
A one-page list to take to the next appointment, with room for notes.
Supporting someone with a diagnosisSupport for patients and families
These independent organizations offer information and support. JBF is not affiliated with them.
- Ovacome UK ovarian cancer support charity with a support line, support groups and information, including on rare germ cell tumors.United Kingdom
- The Robin Cancer Trust UK charity for testicular, ovarian and germ cell cancers offering free materials and community for newly diagnosed young people.United Kingdom
- Ovarian Cancer Research Alliance Peer mentoring, support series, one-to-one counseling and educational webinars for people with ovarian and other gynecologic cancers and families.United States
Sources and further reading
- Treatment of Ovarian Germ Cell Tumors (PDQ)
NCI, Accessed 2026-09-05 - Indications for haematopoietic cell transplantation and CAR-T: 2025 EBMT practice recommendations
EBMT / Bone Marrow Transplantation, Accessed 2026-09-05 - Stem Cell and Bone Marrow Transplants for Cancer
NCI, Accessed 2026-09-05 - Ovarian Germ Cell Tumors Treatment (PDQ), Health Professional Version
National Cancer Institute, Updated 2024-09-18; accessed 2026-09-26 - Childhood Extracranial Germ Cell Tumors Treatment (PDQ), Health Professional Version
National Cancer Institute, Updated 2024-11-05; accessed 2026-09-26 - Malignant germ cells tumor of the ovary
Journal of Gynecologic Oncology (De Maria F, et al.; open access, PMC12099048), 2025; accessed 2026-09-26 - Salvage high-dose chemotherapy in female patients with relapsed/refractory germ-cell tumors: a retrospective analysis of the European Group for Blood and Marrow Transplantation (EBMT)
Annals of Oncology (De Giorgi U, et al.; EBMT Solid Tumours Working Party), abstract, 2017-08-01; accessed 2026-09-26 - NCT02375204: Standard-Dose Combination Chemotherapy or High-Dose Combination Chemotherapy and Stem Cell Transplant in Treating Patients With Relapsed or Refractory Germ Cell Tumors (TIGER)
ClinicalTrials.gov, Record verified 2026-06; accessed 2026-09-26 - Overview of non-epithelial ovarian tumours: Incidence and survival in the Netherlands, 1989-2015
European Journal of Cancer (van der Hel OL, et al.), abstract, 2019; accessed 2026-09-26
This information explains a condition and its treatments. It cannot diagnose an illness or recommend treatment for an individual. Your care team can explain how the evidence applies to you. Written and source-checked by the Jada Bascom Foundation. Each page lists the published sources it draws on.
Ways to help
Other patients need a donor.
A transplant for ovarian germ cell tumor usually uses the patient’s own cells, but thousands of other patients need a donor. For many of them, that donor is a stranger who joined a registry.
Join the registry
JBF points you to the official registry that serves your country. It explains who can join and what donation involves.
Support this work
Gifts to the Jada Bascom Foundation support donor-awareness education like this page, community outreach, drive planning and referrals to official registries.
Help a family find a donor
Our family guide explains practical ways to help someone who needs a donor. A registration drive can add many potential donors at once, for them and for others.
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