Ovarian Cancer Treatment

Ovarian cancer often begins quietly. Symptoms such as bloating, pelvic pressure, abdominal discomfort, appetite changes, urinary frequency, or fatigue can be vague and easy to mistake for less serious conditions. Because of this, many patients are diagnosed after the cancer has already spread within the abdomen or pelvis. Treatment usually depends on the type of ovarian cancer, stage, tumor biology, genetic findings, prior treatment, and the patient’s overall health.

Therapy may be used to treat a focused area of disease rather than the entire abdomen. This can be helpful when a patient has an isolated recurrence, painful metastatic site, enlarged lymph node, bone lesion, bleeding, obstruction, or a small number of growing tumors while the rest of the disease is controlled. In these situations, radiation is used to improve local control, relieve symptoms, and help preserve quality of life.

When Radiation Therapy May Be Used

Radiation may be considered for ovarian cancer in situations such as:

• Isolated pelvic or abdominal recurrence
• Enlarged lymph nodes causing pain, pressure, or blockage
• Bone metastases causing pain or fracture risk
• Bleeding or localized symptoms from advanced disease
• A pelvic mass pressing on the bladder, bowel, nerves, or ureter
• Oligometastatic disease, where a small number of tumor sites can be treated precisely
• A growing lesion that is not responding well while other disease sites remain controlled
• Brain metastases

What Patients Can Expect

For ovarian cancer, radiation is usually targeted to a specific problem area. The first step is treatment planning. A CT simulation scan is performed in the treatment position. If recent PET/CT, MRI, or diagnostic CT scans are available, they may be fused with the planning scan so the physician can see the tumor and surrounding organs more clearly.

Once the areas of interest are delineated, a treatment plan is generated. Different radiation therapy techniques are used because tumors vary in size, shape, location, and proximity to critical organs; the goal is to deliver the most effective dose to the cancer while minimizing radiation exposure to healthy tissues and reducing side effects. Some of the techniques include:

1. 3D-CRT, or 3D Conformal Radiation Therapy uses detailed imaging (such as CT scans) to create a three-dimensional picture of the tumor. Radiation beams are shaped to match the tumor’s size and location, allowing treatment to be more targeted than older methods.
2. IMRT, or intensity-modulated radiation therapy, shapes the dose around the tumor from multiple angles. Instead of treating a broad square field, the plan is sculpted around the area at risk. This helps protect the bowel, bladder, kidneys, liver, spinal cord, and other nearby organs.
3. SBRT, or stereotactic body radiation therapy, is used when the target is small, well-defined, and safely separated from sensitive organs. Because SBRT delivers a stronger dose per session, accuracy is extremely important. Before every treatment, daily cone-beam CT confirms that the patient and tumor area are lined up correctly. Even a few millimeters matter when the target is close to the bowel or bladder.
4. SRS, or stereotactic radiosurgery is a highly precise form of radiation therapy that delivers a very focused, high dose of radiation to a small target—most commonly in the brain—usually in <5 treatment sessions. Despite the name “surgery,” no incision is made. Advanced imaging and positioning techniques allow radiation to be delivered with sub-millimeter accuracy, helping to treat tumors or certain neurological conditions while minimizing radiation exposure to surrounding healthy brain tissue. SRS is used when a very high level of precision is needed for small, well-defined targets.

Treatment is outpatient and painless. Most sessions take about 10 to 20 minutes, including setup and imaging. The sessions take longer if there are many lesions to treat. Patients do not feel the radiation while it is being delivered.

Side Effects and How We Manage Them

Side effects depend on the exact area treated, dose, number of treatments, and whether chemotherapy or other systemic therapy is being given at the same time.

Possible side effects may include:

• Fatigue
• Mild nausea or reduced appetite
• Loose stools, diarrhea, bloating, or abdominal cramping
• Urinary frequency or bladder irritation if the pelvis is treated
• Temporary skin sensitivity in the treated area
• Mild soreness when treating bone metastases
• Rare bowel, bladder, kidney, or nerve irritation depending on tumor location

How we manage these effects:

• We use advanced radiation techniques and daily image guidance to limit dose to healthy organs.
• We provide anti-nausea medication when treating the abdomen or pelvis.
• We manage diarrhea with diet guidance, hydration, and medication when needed.
• We monitor urinary symptoms and prescribe bladder-calming medication if appropriate.
• We coordinate timing with chemotherapy, targeted therapy, or immunotherapy when needed.
• We review bowel and bladder preparation instructions when pelvic treatment requires consistent anatomy.
• We adjust supportive care early so symptoms do not become harder to control.

Ovarian cancer care requires coordination. Radiation is only one part of treatment, and it is most effective when used at the right time for the right target. At ROC, we work closely with gynecologic oncologists and medical oncologists to determine whether radiation can improve local control, reduce symptoms, or support the larger treatment plan.

Call 847-698-0600 ext. 112 to schedule a consultation.