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What is ovarian cancer?
The ovaries are two small organs that store a woman's eggs and make hormones. Ovarian cancer most often begins in the surface (epithelial) cells of the ovary or the nearby fallopian tube and lining of the abdomen. Because the ovaries sit deep in the pelvis, early symptoms — bloating, feeling full quickly, pelvic discomfort, urinary changes — are vague and easy to overlook, so it is frequently found after it has spread within the abdomen. The good news is that even advanced ovarian cancer responds to treatment, and surgery plus chemotherapy, increasingly guided by genetic testing, controls the disease for many women, often for years.
The main types
Doctors group ovarian cancer by where it starts and how it behaves:
| Type | What it means, simply |
|---|---|
| Epithelial ovarian cancer | About 9 in 10 cases — starts in the cells covering the ovary or fallopian tube. High-grade serous is the most common subtype. |
| Germ cell tumors | Begin in the egg-producing cells, more often in younger women, and are usually very treatable and often curable. |
| Stromal tumors | Arise in the hormone-producing support tissue of the ovary; often found early and frequently curable with surgery. |
Staging, in plain terms
Ovarian cancer uses the FIGO system (I-IV), which describes how far the cancer has spread within and beyond the pelvis. Because ovarian cancer tends to spread across the surfaces inside the abdomen, the stage reflects how widely it has seeded rather than a single tumor's size.
| FIGO | What it generally means |
|---|---|
| Stage I | Cancer is confined to one or both ovaries (or fallopian tubes). The most curable stage, treated mainly with surgery. |
| Stage II | Spread to other pelvic organs such as the uterus or bladder, but still within the pelvis. |
| Stage III | Spread to the lining of the abdomen or nearby lymph nodes — the most common stage at diagnosis. Treated with surgery and chemotherapy. |
| Stage IV | Spread to distant organs such as the liver inside or the lungs. Treated with chemotherapy and targeted medicines, often with surgery. |
The standard of care
Ovarian Cancer is almost always treated by a team that may include a surgeon, a medical oncologist, and a radiation oncologist, combining therapies for the best result. The usual building blocks are:
Surgery
Removing as much visible cancer as possible (debulking), usually with the ovaries, uterus, and affected tissue, is central — the less cancer left behind, the better the outcome.
Chemotherapy
Platinum-based chemotherapy given before and/or after surgery shrinks and clears cancer throughout the abdomen and is highly effective for ovarian cancer.
Targeted maintenance therapy
PARP-inhibitor pills and anti-angiogenic drugs, often guided by BRCA and other genetic testing, keep cancer from returning and have transformed long-term control.
Radiation therapy
Used selectively — to treat a specific spot of recurrent or symptomatic disease, or to relieve pain, bleeding, or pressure — rather than as a first-line whole-abdomen treatment today.
How radiation treatment works
Radiation uses focused high-energy x-rays to damage the DNA inside cancer cells so they can no longer divide, while healthy tissue recovers more readily. In ovarian cancer, radiation is used in a focused way — pinpointing a specific area of recurrence or relieving a troublesome symptom — using advanced imaging to protect the bowel, bladder, and other organs. Treatments are painless and brief. Side effects depend on the area treated and may include temporary fatigue or bowel and bladder changes, which are managed and usually settle after treatment.
The main ways radiation is delivered for ovarian cancer:
Stereotactic / focused radiation (SBRT/SRS)
Delivers precise high-dose treatment to an isolated area of recurrence (oligometastatic disease), such as a single lymph node or spot, to control it without affecting the whole body.
Palliative external-beam radiation
A few targeted treatments relieve symptoms — easing pelvic pain, controlling bleeding, or shrinking a mass pressing on the bowel or bladder.
Whole-pelvis radiation (selected cases)
Occasionally used to control disease confined to the pelvis when other options are exhausted, shaped to spare the bowel and bladder.
Latest studies shaping care
Care keeps improving — often toward getting the same excellent results with less burden on patients. A few developments:
PARP inhibitors as maintenance: After chemotherapy, PARP-inhibitor pills dramatically delayed cancer's return — especially in women with BRCA mutations — reshaping how ovarian cancer is managed long-term.[1]
SOLO-1 and PRIMA trials, NEJM
Adding bevacizumab: The anti-angiogenic drug bevacizumab, combined with chemotherapy and continued as maintenance, improved progression-free survival in advanced disease.[2]
GOG-0218 / ICON7 trials
Stereotactic radiation for oligometastatic recurrence: Focused radiation to a limited number of recurrence sites can control disease and delay the need to restart chemotherapy, an area of growing use.[3]
Oligometastatic SBRT series, 2023-2025
Common questions
Is there a screening test for ovarian cancer? No reliable screening test exists for women at average risk. Knowing the subtle symptoms — persistent bloating, feeling full quickly, pelvic or abdominal discomfort, urinary urgency — and reporting them promptly is the best early-warning approach.
Should I get genetic testing? Yes — most women with ovarian cancer should be offered testing for BRCA and related genes, because the results guide targeted treatment and inform your relatives' risk.
Why isn't radiation used as much for ovarian cancer? Because ovarian cancer tends to spread across the whole abdomen, chemotherapy that reaches everywhere is more effective as the main treatment. Radiation is reserved for focused jobs — treating a single spot or relieving symptoms.
References
Numbered sources for the studies cited above. Links open the primary publication on PubMed or the publisher’s site.