Ovarian Cancer: Symptoms, Causes, and Treatment

What is Ovarian Cancer?

Ovarian cancer is a type of cancer that begins in the ovaries, the female reproductive organs that produce eggs (ova) and hormones like estrogen and progesterone. It often goes undetected until it has spread within the pelvis and abdomen, making it more difficult to treat effectively. Ovarian cancer is the fifth leading cause of cancer-related deaths among women, according to the American Cancer Society.

There are several types of ovarian cancer, classified by the type of cell where the cancer begins:

• Epithelial tumors: Start in the thin layer of tissue covering the outside of the ovaries. About 90% of ovarian cancers are epithelial.
• Stromal tumors: Begin in the ovarian tissue that contains hormone-producing cells.
• Germ cell tumors: Start in the egg-producing cells and are more common in younger women.

Early-stage ovarian cancer, where the disease is confined to the ovary, is more likely to be treated successfully. However, only about 20% of cases are diagnosed at this stage, per the American Society of Clinical Oncology (ASCO).

Common Causes

While the exact cause of ovarian cancer is unknown, several factors can increase the risk of developing the disease. These include:

• Age: Ovarian cancer can occur at any age but is most common in women aged 50 to 60 years.
• Inherited gene mutations: A small percentage of ovarian cancers are caused by inherited gene mutations, such as BRCA1 and BRCA2, which also increase the risk of breast cancer. Other gene mutations linked to ovarian cancer include those associated with Lynch syndrome.
• Family history: Having a close relative (mother, sister, or daughter) with ovarian cancer increases your risk.
• Personal history of breast cancer: Women who have had breast cancer have a higher risk of ovarian cancer.
• Obesity: Being overweight or obese (body mass index of at least 30) is associated with a higher risk of ovarian cancer.
• Hormone replacement therapy (HRT): Long-term use of HRT, especially estrogen-only therapy, may slightly increase the risk.
• Endometriosis: This condition, where tissue similar to the lining of the uterus grows outside the uterus, may increase the risk of ovarian cancer.
• Age of menstruation and menopause: Starting menstruation at an early age or beginning menopause at a later age may slightly increase the risk.
• Never being pregnant: Women who have never been pregnant have a higher risk of ovarian cancer than those who have.
• Fertility treatment: Some studies suggest that fertility drugs may increase the risk, though the link is not definitive.

Having one or more of these risk factors does not mean you will develop ovarian cancer, but it’s important to discuss your risk with a healthcare provider. Conversely, some women with ovarian cancer may have no known risk factors.

Associated Symptoms

Ovarian cancer is often called the "silent killer" because its symptoms can be vague and mimic other common conditions, such as digestive or bladder issues. However, being aware of the following symptoms can help with early detection:

• Abdominal bloating or swelling: Persistent bloating that doesn’t go away.
• Pelvic or abdominal pain: Discomfort or pain in the lower abdomen or pelvis.
• Difficulty eating or feeling full quickly: A sensation of fullness even after eating small amounts.
• Urinary symptoms: Frequent urination or urgency to urinate.
• Fatigue: Unexplained tiredness or low energy.
• Back pain: Persistent pain in the lower back.
• Constipation or changes in bowel habits: Digestive issues that don’t resolve with typical treatments.
• Menstrual changes: Irregular periods or postmenopausal bleeding (though this is less common).
• Pain during intercourse: Discomfort or pain during sexual activity.

These symptoms are often persistent and worsen over time. If you experience any of these symptoms daily for more than a few weeks, it’s important to see a healthcare provider for evaluation. According to the Centers for Disease Control and Prevention (CDC), paying attention to your body and recognizing these signs can lead to earlier diagnosis and better outcomes.

When to See a Doctor

You should schedule an appointment with your healthcare provider if you experience any of the following:

• Persistent abdominal bloating, pain, or discomfort that lasts for more than two weeks.
• Difficulty eating or feeling full quickly, accompanied by unintended weight loss.
• Urinary symptoms such as frequency or urgency that don’t improve with typical treatments.
• Unexplained fatigue that interferes with your daily activities.
• Changes in bowel habits, such as constipation or diarrhea, that last for more than a few days.
• Postmenopausal bleeding or irregular menstrual cycles (if you’re still menstruating).
• A family history of ovarian, breast, or colorectal cancer, especially if you have a known genetic mutation like BRCA1 or BRCA2.

Early detection significantly improves the chances of successful treatment. If you have a strong family history of ovarian or breast cancer, consider talking to your doctor about genetic testing or counseling to assess your risk.

Diagnosis

Diagnosing ovarian cancer typically involves a combination of medical history review, physical examinations, imaging tests, and laboratory tests. Here’s what you can expect during the diagnostic process:

Medical History and Physical Exam

Your doctor will ask about your symptoms, personal and family medical history, and any risk factors you may have. A pelvic exam may be performed to check for abnormalities in the ovaries or other reproductive organs, though it’s important to note that ovarian cancer is often not detectable through a pelvic exam alone in its early stages.

Imaging Tests

Imaging tests help visualize the ovaries and surrounding structures to identify tumors or other abnormalities. Common imaging tests include:

• Transvaginal ultrasound: A wand-like device is inserted into the vagina to create images of the ovaries using sound waves.
• Abdominal-pelvic CT scan or MRI: These tests provide detailed cross-sectional images of the abdomen and pelvis to assess the size and spread of tumors.
• Positron emission tomography (PET) scan: This scan can help determine if cancer has spread to other parts of the body.

Blood Tests

Blood tests can help identify markers that may indicate ovarian cancer:

• CA-125 test: This test measures the level of a protein called cancer antigen 125 (CA-125) in the blood. Elevated levels can be a sign of ovarian cancer, but CA-125 can also be elevated due to other conditions like endometriosis, fibroids, or even menstruation. It is not a definitive diagnostic tool but can be useful in monitoring treatment progress.
• Other tumor markers: Tests for HE4, inhibin, lactate dehydrogenase (LDH), and alpha-fetoprotein (AFP) may also be used, depending on the suspected type of ovarian cancer.

Biopsy

A biopsy is the only way to confirm a diagnosis of ovarian cancer. During this procedure, a small sample of tissue is removed from the ovary or tumor and examined under a microscope for cancer cells. A biopsy is often performed during surgery to remove the tumor.

Genetic Testing

If ovarian cancer is diagnosed, your doctor may recommend genetic testing to check for inherited gene mutations, such as BRCA1 or BRCA2. This information can help guide treatment decisions and assess the risk for family members.

Treatment Options

The treatment for ovarian cancer depends on several factors, including the stage and type of cancer, your overall health, and your personal preferences. Treatment typically involves a combination of surgery and chemotherapy, though other options may be considered in certain cases.

Surgery

Surgery is the primary treatment for ovarian cancer and is usually performed by a gynecologic oncologist. The goal of surgery is to remove as much of the tumor as possible (a process called "debulking") and to stage the cancer accurately. Surgical options may include:

• Removal of one or both ovaries (oophorectomy): Depending on the extent of the cancer, one or both ovaries may be removed.
• Removal of the uterus (hysterectomy): In many cases, the uterus is also removed, especially if the cancer has spread.
• Removal of the fallopian tubes (salpingectomy): The fallopian tubes are often removed along with the ovaries.
• Removal of the omentum: The omentum is a fatty layer of tissue that covers the abdomen and is often a site where ovarian cancer spreads.
• Lymph node biopsy: Lymph nodes in the pelvis and abdomen may be removed to check for cancer spread.

In early-stage ovarian cancer, surgery may be the only treatment needed. For advanced-stage cancer, surgery is often followed by chemotherapy.

Chemotherapy

Chemotherapy uses drugs to kill cancer cells and is typically administered after surgery to destroy any remaining cancer cells. Chemotherapy can be given intravenously (IV) or directly into the abdomen (intraperitoneal chemotherapy). Common chemotherapy drugs for ovarian cancer include:

• Carboplatin
• Paclitaxel (Taxol)
• Cisplatin
• Doxorubicin (Adriamycin)

Chemotherapy is usually given in cycles, with each cycle followed by a rest period to allow your body to recover. Side effects can include nausea, hair loss, fatigue, and an increased risk of infection.

Targeted Therapy

Targeted therapy uses drugs that specifically target the genetic or molecular changes in cancer cells. For ovarian cancer, targeted therapies may include:

• PARP inhibitors: Drugs like olaparib (Lynparza), rucaparib (Rubraca), and niraparib (Zejula) are used to treat ovarian cancer, particularly in women with BRCA mutations. These drugs prevent cancer cells from repairing their DNA, leading to cell death.
• Bevacizumab (Avastin): This drug targets a protein called VEGF, which helps tumors grow new blood vessels. It is often used in combination with chemotherapy.

Hormone Therapy

Hormone therapy may be used for certain types of ovarian cancer, such as stromal tumors, which are hormone-sensitive. Drugs like tamoxifen or aromatase inhibitors may be prescribed to block the effects of estrogen on cancer cells.

Immunotherapy

Immunotherapy is a newer approach that helps the immune system recognize and attack cancer cells. While still being studied for ovarian cancer, drugs like pembrolizumab (Keytruda) are being tested in clinical trials for women with advanced or recurrent ovarian cancer.

Clinical Trials

Participating in a clinical trial may provide access to new treatments that are not yet widely available. Clinical trials test the safety and effectiveness of new drugs, therapies, or treatment combinations. Talk to your doctor about whether a clinical trial might be right for you.

Palliative Care

For women with advanced ovarian cancer, palliative care focuses on relieving symptoms and improving quality of life. This may include pain management, nutritional support, and emotional or psychological counseling.

Prevention Tips

While there is no sure way to prevent ovarian cancer, certain strategies may help reduce your risk:

• Consider birth control pills: Oral contraceptives (birth control pills) have been shown to reduce the risk of ovarian cancer, especially when taken for several years. According to the American Cancer Society, women who use oral contraceptives for 5 or more years have about a 50% lower risk of developing ovarian cancer.
• Discuss genetic testing: If you have a strong family history of ovarian or breast cancer, talk to your doctor about genetic counseling and testing for BRCA1, BRCA2, or other gene mutations linked to ovarian cancer.
• Pregnancy and breastfeeding: Having one or more full-term pregnancies and breastfeeding may lower your risk of ovarian cancer.
• Maintain a healthy weight: Obesity is linked to an increased risk of ovarian cancer, so maintaining a healthy weight through diet and exercise may help reduce your risk.
• Consider prophylactic surgery: Women with a high risk of ovarian cancer (e.g., those with BRCA mutations) may choose to have their ovaries and fallopian tubes removed (prophylactic oophorectomy) to prevent cancer. This is typically recommended after childbearing is complete.
• Avoid hormone replacement therapy (HRT): Long-term use of estrogen-only HRT may increase the risk of ovarian cancer. If you need HRT for menopausal symptoms, discuss the risks and benefits with your doctor.
• Eat a healthy diet: A diet rich in fruits, vegetables, whole grains, and lean proteins may help lower your risk of cancer. Some studies suggest that foods high in antioxidants and fiber may be particularly beneficial.
• Stay physically active: Regular exercise can help maintain a healthy weight and reduce cancer risk. Aim for at least 150 minutes of moderate-intensity exercise per week.
• Be aware of symptoms: Pay attention to your body and report any persistent or unusual symptoms to your doctor promptly.

While these strategies may help lower your risk, they do not guarantee prevention. Regular check-ups and open communication with your healthcare provider are essential for early detection and management.

Emergency Warning Signs

Ovarian cancer can sometimes lead to complications that require immediate medical attention. Seek emergency care if you experience any of the following:

• Severe abdominal pain or swelling: Sudden, intense pain or rapid abdominal distension could indicate a medical emergency, such as a bowel obstruction or tumor rupture.
• Difficulty breathing or shortness of breath: This could be a sign of fluid buildup in the lungs (pleural effusion) or cancer spread to the lungs.
• Severe nausea or vomiting: Persistent vomiting, especially if you’re unable to keep fluids down, may lead to dehydration and require urgent care.
• Signs of a bowel obstruction: Symptoms include severe constipation, inability to pass gas, vomiting, and intense abdominal pain. A bowel obstruction is a medical emergency.
• Severe fatigue or weakness: If you feel extremely weak, dizzy, or lightheaded, especially if accompanied by rapid heartbeat or fainting, seek medical help immediately.
• Heavy or uncontrolled vaginal bleeding: While uncommon in ovarian cancer, heavy bleeding could indicate a serious issue and should be evaluated promptly.
• Signs of infection: Fever, chills, or severe pain could indicate an infection, especially if you’re undergoing chemotherapy, which weakens the immune system.

If you or someone you know experiences any of these emergency warning signs, call 911 or go to the nearest emergency room immediately. Early intervention can be life-saving.

Conclusion

Ovarian cancer is a serious and often silent disease that requires awareness, early detection, and prompt treatment. While the symptoms can be vague and easily mistaken for other conditions, paying attention to persistent changes in your body and discussing any concerns with your healthcare provider is crucial. If you have risk factors such as a family history of ovarian or breast cancer, genetic testing and proactive measures like prophylactic surgery may be worth considering.

Treatment for ovarian cancer has advanced significantly in recent years, with options like targeted therapy and immunotherapy offering new hope for better outcomes. However, the key to successful treatment remains early diagnosis. By staying informed, maintaining a healthy lifestyle, and seeking medical attention for any concerning symptoms, you can take important steps to protect your health.

For more information, visit reputable sources like the American Cancer Society, Centers for Disease Control and Prevention (CDC), or National Institutes of Health (NIH).