Ovarian Germ Cell Tumors, from the CureRays guide library.

Ovarian germ cell tumors mostly affect girls and young women and are among the most curable cancers — usually treated with fertility-sparing surgery and, when needed, highly effective chemotherapy, with radiation reserved for select situations.

What it is.

Ovarian germ cell tumors are cancers that begin in the egg-producing (germ) cells of the ovary. They are very different from the common epithelial ovarian cancer that affects older women: germ cell tumors occur mainly in girls and young women, often in the teens and twenties, and they tend to grow quickly but respond extremely well to treatment, making them among the most curable of all cancers. Because a fast-growing mass can stretch the ovary, the first symptoms are often belly pain or swelling, a feeling of fullness or pressure, or a mass the patient or a doctor can feel. Many of these tumors release substances into the blood — tumor markers such as AFP and beta-hCG — that help diagnose them, track how well treatment is working, and watch for any return. There are several subtypes. The most common malignant one is the dysgerminoma; others include the yolk sac tumor, immature teratoma, embryonal carcinoma, choriocarcinoma, and mixed tumors that contain more than one of these. (A separate, very common type — the mature cystic teratoma, or dermoid cyst — is benign and not cancer.) The guiding principles of care are shaped by who these patients are: because they are usually young, treatment is designed to cure the cancer while preserving fertility whenever possible. That typically means removing just the affected ovary rather than both, and giving chemotherapy — which is remarkably effective for these tumors — when more than surgery is needed. Radiation, once used more often (especially the radiation-sensitive dysgerminoma), now plays a limited, selective role because chemotherapy is so effective and spares fertility.

How radiation treats it.

Radiation therapy uses focused beams of energy to damage the DNA inside cancer cells so they can no longer grow and divide. Ovarian germ cell tumors — especially the dysgerminoma subtype — are quite sensitive to radiation, and decades ago radiation was a more common part of treatment. Today its role is deliberately limited, and understanding why tells the story of how care for these cancers has improved. These tumors usually occur in girls and young women, for whom preserving fertility and avoiding long-term effects on healthy tissue is a priority, and chemotherapy turned out to be so effective at curing them — even when advanced — that it largely replaced radiation as the treatment added to surgery. Chemotherapy also has the advantage of treating the whole body and sparing the ovaries and uterus, whereas radiation aimed at the abdomen or pelvis can affect fertility. As a result, modern radiation is reserved for selective situations: treating a specific area of residual or recurrent disease (particularly with the radiation-sensitive dysgerminoma) when chemotherapy is not the best option, controlling an isolated tumor deposit with precise high-dose techniques, or relieving symptoms such as pain or pressure with a short palliative course. When radiation is used in a young patient, it is planned carefully to shield the remaining ovary and the uterus as much as possible. The broader message is an encouraging one: because surgery and chemotherapy cure the overwhelming majority of these patients, radiation is no longer a routine part of treatment, but it remains a useful, precise tool for the specific circumstances where it offers the clearest benefit.

The ways we can treat it.

Selective external-beam radiation. Focused external-beam radiation can treat specific areas of disease — such as residual or recurrent tumor in lymph nodes — particularly for dysgerminoma, which is highly radiation-sensitive, when chemotherapy is not the preferred choice.

Palliative radiation. A short, targeted course of radiation can relieve symptoms from a tumor that is pressing on a structure or causing pain, improving comfort when needed.

Stereotactic radiation for isolated spots. Precise, high-dose radiation can control a small number of isolated tumor deposits, for example in selected recurrences, while sparing surrounding tissue.

Fertility-protective planning. When radiation is used in a young patient, treatment is planned to shield the remaining ovary and uterus as much as possible to protect future fertility.

Questions we hear often.

Will I be able to have children after treatment? Very often, yes. Because these cancers mostly affect young women and are so curable, treatment is designed to preserve fertility. The standard surgery removes only the affected ovary and tube, leaving the uterus and the other ovary in place, and the highly effective chemotherapy used when needed generally allows fertility to be preserved. Discuss fertility planning with your team before treatment begins.

Why isn't radiation used much for this cancer anymore? Even though some of these tumors — especially dysgerminoma — are sensitive to radiation, chemotherapy turned out to cure them just as well or better while sparing the ovaries and uterus. Since radiation aimed at the pelvis can affect fertility, it has been largely replaced by chemotherapy and is now reserved for selective situations, such as treating a specific area of disease or relieving symptoms.

What are tumor markers, and why are my blood levels being checked? Many ovarian germ cell tumors release substances called AFP and beta-hCG into the blood. Measuring them helps confirm the diagnosis, shows whether treatment is working as the levels fall, and provides an early warning if the cancer comes back. That is why your team checks these blood markers during and after treatment.

This guide is informational only. It is not medical advice — please confirm anything here with your care team.