A Clear Guide to Ovarian Cancer Treatment by Stage

How Ovarian Cancer is Staged

Before exploring treatments, it’s helpful to understand what the stages mean. Staging is a process doctors use to determine how far the cancer has spread. This is a crucial factor in planning the most effective treatment. The stages are based on the FIGO (International Federation of Gynecology and Obstetrics) system.

• Stage 1: The cancer is confined entirely to one or both ovaries.
• Stage 2: The cancer is in one or both ovaries and has spread to other tissues within the pelvis, such as the uterus or fallopian tubes.
• Stage 3: The cancer has spread beyond the pelvis to the lining of the abdomen (peritoneum) or to nearby lymph nodes.
• Stage 4: The cancer has metastasized, or spread, to distant organs outside the abdominal cavity, such as the liver, lungs, or bones.

Primary Treatment Methods for Ovarian Cancer

Most treatment plans for ovarian cancer involve a combination of approaches. The main methods used are surgery and chemotherapy, often supplemented by other advanced therapies.

• Surgery: This is typically the first step for most stages. The primary goals of surgery are to accurately stage the cancer and to remove as much of the tumor as possible. This is called “debulking” or “cytoreductive surgery.” Common surgical procedures include a total hysterectomy (removal of the uterus), a bilateral salpingo-oophorectomy (removal of both ovaries and fallopian tubes), and removal of the omentum (a fatty layer of tissue covering the abdominal organs).
• Chemotherapy: This involves using powerful drugs to kill cancer cells throughout the body. These drugs are often given intravenously (IV). The most common chemotherapy combination for ovarian cancer includes a platinum-based drug, such as carboplatin or cisplatin, combined with a taxane drug, like paclitaxel (Taxol) or docetaxel (Taxotere).
• Targeted Therapy: These newer drugs are designed to attack specific vulnerabilities in cancer cells. They often have different, and sometimes less severe, side effects than standard chemotherapy. Examples include PARP inhibitors and angiogenesis inhibitors.

Stage 1 Ovarian Cancer Treatment

When ovarian cancer is caught in Stage 1, it is highly treatable. The primary treatment is surgery. The goal of the surgery is both to treat the cancer and to formally stage it by taking tissue samples from various areas in the pelvis and abdomen to ensure it has not spread.

For most women, the surgery involves a total hysterectomy and a bilateral salpingo-oophorectomy. Lymph nodes in the pelvis and abdomen may also be removed and checked for cancer cells.

After surgery, the need for further treatment depends on the cancer’s grade (how abnormal the cells look under a microscope).

• Low-Grade (Grade 1): For Stage 1A or 1B low-grade tumors, surgery alone may be sufficient, and no further treatment might be needed.
• High-Grade (Grade 2 or 3) or Stage 1C: For these cancers, there is a higher risk of recurrence. Doctors will almost always recommend adjuvant chemotherapy after surgery. This typically involves 3 to 6 cycles of a combination like carboplatin and paclitaxel to destroy any remaining cancer cells.

Stage 2 Ovarian Cancer Treatment

In Stage 2, the cancer has spread from the ovaries to nearby areas in the pelvis. The treatment approach becomes more aggressive to address this spread.

The standard treatment begins with comprehensive staging and debulking surgery. The surgeon’s goal is to remove all visible signs of the tumor. This includes performing a total hysterectomy, bilateral salpingo-oophorectomy, and removing any other pelvic tissues where the cancer has spread.

Following surgery, combination chemotherapy is a standard part of the treatment plan. Patients typically receive at least 6 cycles of a platinum-based regimen, such as carboplatin and paclitaxel, to target any cancer cells that may have been left behind.

Stage 3 Ovarian Cancer Treatment

Stage 3 is considered advanced ovarian cancer, as it has spread to the upper abdomen or lymph nodes. The main goal of treatment is to remove as much of the cancer as possible and control its growth.

The primary treatment is aggressive cytoreductive (debulking) surgery. An experienced gynecologic oncologist will attempt to remove all tumors larger than 1 centimeter. This is a critical factor in improving a patient’s outlook.

After surgery, patients receive combination chemotherapy, usually with carboplatin and paclitaxel. In some cases, the chemotherapy may be administered both intravenously (IV) and directly into the abdominal cavity, a method called intraperitoneal (IP) chemotherapy.

For some patients with Stage 3 cancer who may not be healthy enough for extensive surgery, or if the tumor is too widespread to be effectively removed, doctors might recommend neoadjuvant chemotherapy. This means giving a few cycles of chemo before surgery to shrink the tumors, making them easier to remove. Surgery is then followed by more chemotherapy.

Maintenance therapy with a targeted drug, such as the angiogenesis inhibitor bevacizumab (Avastin) or a PARP inhibitor like olaparib (Lynparza), may be recommended after chemotherapy to help prevent the cancer from returning.

Stage 4 Ovarian Cancer Treatment

Stage 4 is the most advanced stage, meaning the cancer has spread to distant organs like the liver or lungs. While a cure is less likely, treatment focuses on shrinking the tumors, managing symptoms, and prolonging life while maintaining the best possible quality of life.

Treatment usually begins with systemic therapy, such as chemotherapy, to treat the cancer throughout the body. Surgery may still be an option, but it is typically used to relieve symptoms, such as a bowel obstruction, rather than to attempt to remove all the cancer.

In many cases, doctors will use neoadjuvant chemotherapy to shrink tumors before considering debulking surgery. If the chemotherapy is effective, surgery may be performed, followed by additional chemo cycles.

Targeted therapies play a major role in treating Stage 4 ovarian cancer.

• Bevacizumab (Avastin) is often combined with chemotherapy to stop the growth of new blood vessels that feed tumors.
• PARP inhibitors, such as olaparib (Lynparza), niraparib (Zejula), and rucaparib (Rubraca), are highly effective as maintenance therapy, especially for women with a BRCA gene mutation.

Participation in clinical trials is also a very important option for Stage 4 patients, offering access to new and innovative treatments that are not yet widely available.