Ovarian cancer is a cancer that develops in a woman's ovary. It can be difficult to detect in its early stages. Unlike cervical and breast cancers, there are currently no effective screening methods for ovarian cancer. The majority of women are diagnosed when the cancer is in an advanced stage.
If you are diagnosed with ovarian cancer, you should be referred to a gynecologic oncologist, a doctor who specializes in diagnosing and treating cancers of the female reproductive system. Outcomes are best when women receive care in hospitals and from doctors with experience treating ovarian cancer.
The main risk factors of ovarian cancer are:
Factors that may help reduce the risk of ovarian cancer include:
BRCA Genetic Mutations
Guidelines from the United States Preventive Service Task Force recommend screening for BRCA genetic mutations in women whose family history suggests a high risk for ovarian cancer. Mutations in the genes called BRCA1 and BRCA2 are among the strongest risk factors for ovarian and breast cancers. Women who do not have risk factors do not need to be screened.
Your health care provider may screen your risk for these genes using a questionnaire. The Centers for Disease Control and Prevention has also developed an on-line screening resource (Know:BRCA Tool) that woman can use to understand their risks. Having several first-degree or second-degree relatives who have had breast, ovarian, fallopian tube, or peritoneal cancers is an indication of risk.
If you are at risk, you may be referred to a genetic counselor who can review your history and discuss with you whether you should be tested for these genetic mutations.
Targeted Therapy Drug Approval
In 2014, the FDA approved bevacizumab (Avastin) in combination with chemotherapy for treatment of resistant or recurrent ovarian cancer. Bevacizumab is a biologic drug that targets and blocks a protein associated with blood vessel growth.
Ovarian cancer is cancer that begins in a woman's ovary. The ovaries produce eggs (ova), and the hormones estrogen and progesterone. A woman's reproductive system includes the:
The ovaries are two small, almond-shaped organs located on either side of the uterus. Each ovary is attached to a fallopian tube. Both fallopian tubes connect to the uterus. During a woman's monthly reproductive cycle, an egg is released by an ovary, and travels down the fallopian tube towards the uterus to await fertilization.
The uterus, commonly called the womb, is a hollow muscular organ located in the female pelvis between the bladder and rectum. The ovaries produce the eggs that travel through the fallopian tubes. Once the egg has left the ovary it can be fertilized and implant itself in the lining of the uterus. The main function of the uterus is to nourish the developing fetus prior to birth.
Ovarian cancers begin when cells in an ovary that grow abnormally quickly and develop into a tumor. Some tumors are benign (non-cancerous). Others are malignant (cancerous.) Ovarian tumors may be either solid or cystic (fluid-filled sacs). They can look very similar in appearance to benign ovarian cysts, which are very common.
Ovarian cancers can develop in the different types of cells that make up the ovary. They are usually one of three types:
Ovarian cancer progresses almost silently, usually with vague symptoms. By the time serious symptoms do appear, the ovarian tumor may have grown large enough to shed cancer cells throughout the abdomen. At such an advanced stage, the cancer is more difficult to cure.
As ovarian cancer advances, cells from the original tumor can spread (metastasize) throughout the pelvic and abdominal regions and travel to other parts of the body. Cancer cells are carried through the body through lymph vessels and the bloodstream.
Ovarian cancer is the fifth leading cause of cancer death in women. Each year in the United States, about 22,000 women are diagnosed with ovarian cancer. About 14,000 American women die each year from this disease.
Certain factors increase the risk for ovarian cancer, while other factors reduce risk. Inherited genetic mutations of BRCA genes are the strongest risk factor. A family history of breast or ovarian cancer is also a strong risk factor.
Many of the preventive factors are related to the number of times a woman ovulates during her lifetime, which is indicated by the number of menstrual periods she has. Fewer menstrual periods and ovulations appear to be associated with reduced risk for ovarian cancer.
Age: Older women have a higher risk for ovarian cancer than younger women. Ovarian cancer usually occurs after menopause, although it can develop in women of all ages. Most women diagnosed with ovarian cancer are older than age 55.
Ethnicity: Ovarian cancer is more common in white women than in African American women. Women who are of Ashkenazi (Eastern European) Jewish descent have a higher risk for developing ovarian cancer.
Family History: Women are at high risk for ovarian cancer and for harboring a genetic mutation such as BRCA if they have a:
When a woman describes her family history to her doctor, she should include the history of cancer in women on both the mother's and the father's side. Both are significant.
Genetic Mutations: Inherited mutations in the genes called BRCA1 and BRCA2 greatly increase the risk for ovarian and breast cancers. While these mutations are more common among women of Ashkenazi Jewish ancestry, they can occur in women of any ethnicity.
Women with a BRCA1 mutation have about a 40 to 60% lifetime risk for ovarian cancer. Women with a BRCA2 mutation have about a 10 to 30% lifetime risk for ovarian cancer. (By contrast, the lifetime ovarian cancer risk for women in the general public is about 1 in 55 or 1.8%.)
Other genetic factors are also associated with increased risk. Women who have genetic mutations associated with hereditary non-polyposis colorectal cancer (HNPCC) have about a 10 to 15% lifetime risk of developing ovarian cancer.
Personal Medical History:Women who have been diagnosed with breast cancer are at increased risk for ovarian cancer, even if they do not have BRCA mutations. Endometriosis, a condition in which the cells that line the cavity of the uterus grow in other areas of the body such as on the ovaries, increases the risk for ovarian cancer.
Reproductive History: Women are at increased risk for ovarian cancer if they began menstruating at an early age (before age 12), have not had any children, had their first child after age 35, or experienced early menopause (before age 50).
There are also preventive factors associated with reproductive history. The more times a woman gives birth, the less likely she is to develop ovarian cancer. Breast-feeding for a year or more after giving birth may also decrease ovarian cancer risk.
Tubal ligation, a method of sterilization that ties off the fallopian tubes, is associated with a decreased risk for ovarian cancer when it is performed after a woman has completed childbearing. Similarly, hysterectomy, the surgical removal of the uterus, may decrease risk.
Hormone Use: Women who use hormone therapy (HT) after menopause for longer than 5 years may have an increased risk for ovarian cancer. The risk seems to be particularly significant for women who take estrogen-only HT. The risk is less clear for combination estrogen-progestin HT.
Oral contraceptives (birth control pills) significantly reduce the risk of ovarian cancer. The longer a woman takes oral contraceptives the greater the protection and the longer protection lasts after stopping oral contraceptives.
Obesity: Women who are obese have an increased risk for ovarian cancer.
Women with a strong family history of ovarian or related cancers should discuss preventive strategies with their health care providers.
Screening for BRCA Genetic Mutations: Guidelines from the U.S. Preventive Services Task Force (USPSTF) recommend BRCA screening for women at high risk for ovarian cancer due to persona or family history. The USPSTF does not recommend routine genetic screening or testing in women whose family history does not suggest BRCA mutations. Having several first-degree or second-degree relatives who have had breast, ovarian, fallopian tube, or peritoneal cancers is an indication of risk.
Your health care provider can screen you using a questionnaire that evaluates your family and personal medical history, and other factors. If your provider decides you are at risk, you may be referred to a genetic counselor who can review your history and discuss with you whether you should be tested for the BRCA1 and BRCA2 mutations, or for other genetic mutations that may be present.
The genetic test uses DNA from a blood or saliva sample to check for these mutations. A positive test means that the mutations are present. It does not, however, mean that a woman will definitely develop ovarian or breast cancer.
Removal of Ovaries (Oophorectomy): Surgical removal of the ovaries, called oophorectomy, significantly reduces the risk for ovarian cancer. When it is used to prevent cancer, the procedure is called a prophylactic oophorectomy.
Prophylactic oophorectomy is approximately 95% protective against ovarian cancer and is recommended for women at high risk for ovarian cancer. These women generally have the BRCA1 or BRCA2 genetic mutation, or have two or more first-degree relatives who have had ovarian cancer.
Bilateral oophorectomy is the removal of both ovaries. Bilateral salpingo-oophorectomy is the removal of both fallopian tubes plus both ovaries. Evidence is accumulating that many ovarian cancers actually arise in the fallopian tubes and secondarily involve the ovary. There is strong evidence that salpingo-oophorectomy is very effective in reducing risk for ovarian cancer in women who carry the BRCA1 or BRCA2 mutation.
Primary peritoneal carcinoma, a rare cancer that develops in the peritoneum (the thin membrane that lines the inside of the abdomen), can still develop in women who have their ovaries and tubes removed. Some of these peritoneal cancers may actually come from small tumors that originated in the fallopian tubes. Some evidence suggests that preventive salpingo-oophorectomy may reduce the risk for peritoneal cancer and fallopian tube cancers, in addition to ovarian cancer.
Oophorectomy causes immediate menopause, which can raise health concerns for premenopausal women. You should discuss all the risks and benefits of prophylactic oophorectomy with your health care team, as well as the option for hormone therapy after surgery.
Ovarian cancer used to be considered a "silent killer." Symptoms were thought to appear only when the cancer was in an advanced stage. Evidence now suggests that even early-stage ovarian cancer can produce symptoms.
Ovarian cancer grows quickly and can progress from early to advanced stages within a year. Paying attention to symptoms can help improve a woman's chances of being diagnosed and treated promptly. Detecting cancer while it is still in its earliest stages may help improve prognosis.
See your health care provider if you have the following symptoms on a daily basis for more than a few weeks:
Other symptoms that are sometimes associated with ovarian cancer include:
Be aware that these symptoms are very common in women who do not have cancer and are not specific for ovarian cancer. While prompt follow-up with your provider is important when one or more of these are present, there are many other explanations for these symptoms besides ovarian cancer.
Based on symptoms and physical examination, your provider may order pelvic imaging tests or blood tests. If these tests reveal possible signs of cancer, you should be referred to a gynecologic oncologist.
Ovarian cancer is difficult to detect in its early stages. Unlike Pap tests for cervical cancer or mammogram for breast cancer, there is currently no effective screening method for ovarian cancer.
Imaging tests, such as transvaginal ultrasound, and blood tests, such as CA-125, have not proven to be useful screening tools. Studies indicate that screening with these tests does not reduce ovarian cancer death and may cause women to undergo unnecessary medical treatment due to their high rate of "false positives."
The United States Preventive Services Task Force and other medical associations do not recommend routine screening for ovarian cancer in women who do not have signs or symptoms of the disease. However, if your health care provider thinks you may have ovarian cancer, these tests can help in diagnosis. Some diagnostic tests are also used in the treatment process.
Physical signs indicating ovarian cancer may be detected during a pelvic exam. A pelvic exam is performed in two ways. The doctor inserts two fingers into the vagina while feeling the abdomen with the other hand. The doctor also performs a rectovaginal exam, which involves the insertion of one finger into the vagina and another into the rectum.
Both exams enable the doctor to evaluate the size and shape of the ovaries. Enlarged ovaries and abdominal swelling can be signs of ovarian cancer. A mass felt during a pelvic exam often requires further evaluation by ultrasound and sometimes requires surgery to make a definitive diagnosis.
Not all masses felt are cancerous. They may be benign conditions such as ovarian cysts or uterine fibroids.
Ultrasound: Transvaginal ultrasound is a noninvasive diagnostic procedure that uses sound waves to bounce off tissues, organs, and masses in the pelvic area. It creates a visual picture of the ovaries, cervix, and uterus.
A probe, called a transducer, placed in the vagina sends out the sound waves. The echoes are collected and converted into a picture of the area. The image can help evaluate the size and internal structure of the ovaries and distinguish a solid mass (like ovarian cancer) from fluid-filled masses (like ovarian cysts.)
Transvaginal ultrasound does not provide enough specific information to reliably determine whether abnormal masses are cancerous. This test is not helpful as a screening tool for women who do not have signs of ovarian cancer.
Other Imaging Techniques: Other imaging tests are less common for the diagnosis or evaluation of suspected ovarian cancer but may help determine if cancer has spread to other parts of the body. They include:
CA-125 Blood Test: CA-125 is a protein that is secreted by ovarian cancer cells and is elevated in over 80% of people with ovarian cancer. A blood test for this protein is usually ordered only if ovarian cancer is strongly suspected or has been diagnosed. In general, a CA-125 level is considered to be normal if it is less than 35 U/mL (microns per milliliter). The test may also be useful for evaluating tumor growth and predicting survival in people with recurrent cancer.
The test is not useful for diagnosis or early screening. In about half of women with very early ovarian cancer, CA-125 levels are not elevated above the normal standard. Furthermore, an elevated level can be caused by a number of other conditions including:
OVA1 Blood Test: The OVA1 blood test helps predict whether ovarian cancer is more likely to be present in a pelvic mass. The test measures the level of CA-125 and four other proteins. Test results can help non-oncologist health care providers decide which women should be referred to a gynecologic oncologist for evaluation and consideration of surgery.
The OVA1 test is used in addition to, not in place of, other diagnostic and clinical procedures. It is not used to screen for or provide a definite diagnosis of ovarian cancer, but can help determine that a malignancy is more likely to be present, and that referral to a specialist is suggested.
A biopsy (tissue sample) is the only way to confirm a diagnosis of ovarian cancer. Biopsies for ovarian cancer are performed through exploratory surgery. A gynecological oncologist should perform this surgery. There are several surgical approaches:
The surgeon will take tissue samples and remove the tumor. The surgeon will also examine the organs and evaluate the spread of the cancer. Other surgical procedures, such as hysterectomy, removal or lymph nodes, appendectomy, omentectomy (removal of fatty tissue hanging from the colon) may also be performed.
The tissue samples are sent to a pathology lab for testing. If the test results indicate cancer, the woman may have additional imaging tests to see how far the cancer has spread. Based on biopsy and imaging tests, the cancer is staged.
Ovarian cancer is staged based on:
The TNM system is used to classify cancer in stages I to IV. Each stage is further divided into substages.
Stage I: In stage I, the cancer has not spread. It is confined to one ovary (stage IA) or both ovaries (stage IB). In stages IA and IB, the ovarian capsules are intact, and there are no tumors on the surface. Stage IC can affect one or both ovaries, but the tumors are on the surface, or the capsule (outer covering of the ovary) has burst, or there is evidence of tumor cells in abdominal fluid (ascites).
Stage II: In stage II, the cancer is in one or both ovaries and has spread to other areas in the pelvis. It may have advanced to the uterus or fallopian tubes (stage IIA), or other areas within the pelvis such as the bladder, colon or rectum (stage IIB), but is still limited to the pelvic area.
Stage III: In stage III, the cancer is in one or both ovaries and has spread outside of the pelvis to nearby abdominal regions or lymph nodes. In Stage IIIA, microscopic amounts of cancer are in the peritoneum (the lining of the abdomen) or involve the lymph nodes. In Stage IIIB, the cancer is visually detectable in the peritoneum, with masses up to 2 cm in size with or without lymph node involvement. In Stage IIIC, the cancer has grown larger in the peritoneum, greater than 2 cm in size, with or without lymph node involvement.
Stage IV: Stage IV is the most advanced cancer stage. In Stage IVA, the cancer has spread to the fluid around the lungs. In Stage IVB, the cancer has spread to the liver or spleen or to other distant organs such as the lungs, brain, and bones.
Survival rates for ovarian cancer vary depending on many different factors, including the age of the woman and the stage at the time of diagnosis. Unfortunately, most cases with ovarian cancer are not diagnosed until the disease is advanced and has metastasized. In general, 75% of women survive ovarian cancer at least 1 year after diagnosis.
A 5-year survival rate is an estimate based on the percentage of people who are still alive 5 years after their cancer is diagnosed. In ovarian cancer:
Surgery is the initial treatment for most women with suspected ovarian cancer. Surgery is usually followed by chemotherapy. The course of treatment is determined by the stage of the cancer. Clinical trials investigating new types of treatments are an option for all stages of ovarian cancer.
It is very important that women with ovarian cancer to seek care from a qualified gynecologic oncologist (a surgical specialist in female reproductive cancers) and a qualified medical oncologist with special expertise in the chemotherapeutic management of gynecologic cancer. Many gynecologic oncologists also have expertise in chemotherapeutics and provide this aspect of care.
Studies indicate that it is best for people, especially those with advanced-stage ovarian cancer, to receive care at medical centers that specialize in cancer treatment and surgery. Outcomes are best when women receive care from hospitals and doctors who treat a large number of ovarian cancer cases.
Women of child-bearing age should discuss with their cancer team any concerns and questions they may have about how various treatments could affect their fertility. They may also wish to have a consultation with a fertility specialist. Assisted reproductive technology such as embryo or oocyte (egg) cryopreservation ("freezing") may offer some women an option to later have children. It is very important that you have these discussions with your health care team before you begin cancer treatment.
Treatment options for stage I and stage II ovarian epithelial cancer may include:
Treatment options for stage III and stage IV ovarian epithelial cancer may include:
If ovarian cancer returns or persists after treatment, chemotherapy is the main treatment. Surgery may also be performed to attempt an interval debulking, or to resolve such issues as urinary or intestinal blockages. Radiation therapy may be used to provide symptom relief. Clinical trials are investigating targeted therapy and hormone therapy.
After treatment is completed, you should have regular follow-up visits and tests to monitor your health and to check for any signs of cancer recurrence.
Recommended tests include:
Discuss with your cancer team how often you will need these tests. Some guidelines recommend follow-up visits:
You will usually have a CA-125 blood test at every visit. Your oncologist may also recommend imaging tests.
Surgery for ovarian cancer is used for both diagnostic and treatment purposes. Surgery has two goals:
It is extremely important that staging and debulking be performed by an experienced surgeon trained in cancer surgery techniques (usually a gynecologic oncologist). Accurate staging is essential for determining treatment options. Successful debulking will reduce the likelihood of repeat surgeries and increase the odds for survival.
Surgical staging involves taking biopsies (tissue samples) of:
An abdominal wash is performed by injecting a salt solution into the abdominal cavity to collect a fluid sample. The tissue and fluid samples are sent to a laboratory for evaluation. If immediate information is required, the pathologist may perform a frozen section with a diagnosis available in 20 minutes.
The entire affected ovary is usually removed (oophorectomy) during surgical staging if the surgeon believes it might be cancerous. The surgeon will also examine the pelvic region, including the bowel and bladder, for signs of cancer invasion. If it appears the cancer has spread, the surgeon will remove the suspected cancer tissue (debulking).
Debulking, also called surgical cytoreduction, involves removing as much of the cancer as possible. The goal is to leave behind no tumor larger than 1 centimeter and preferably to leave behind no clearly visible tumor.
The surgery is typically performed as follows:
Side Effects: Hysterectomy results in infertility. A woman will no longer have menstrual periods and she can no longer become pregnant. Surgical removal of the ovaries (oophorectomy) causes immediate menopause. Symptoms, such as hot flashes, come on abruptly and may be more intense than those of natural menopause. Other menopausal symptoms include vaginal dryness, sleep problems, and weight gain.
The most important complications that occur in women who have had their ovaries removed are due to estrogen loss, which places women at risk for osteoporosis (loss of bone density) and a possible increase in risks for heart disease.
Hormone therapy after a hysterectomy is given as estrogen-only therapy (ET). It does have risks, including possibly increasing the chances for breast cancer and stroke. (Some recent data question these risks for women who do not receive estrogen in combination with progesterone.) It does not appear to increase the risk for ovarian cancer recurrence.
The decision to use estrogen therapy (ET) depends in part on a woman's age as well as other medical factors. For younger women (under age 40), the benefits of ET for bone and heart health may outweigh the risks. For women closer to the age of menopause, risks may outweigh benefits. Discuss with your oncologist whether hormone therapy is a safe or appropriate option for you.
Chemotherapy is drug therapy used to kill cancer cells that remain after surgery. Chemotherapy usually follows surgery (adjuvant chemotherapy). In some cases, it may also be used before surgery (neoadjuvant chemotherapy).
Chemotherapy is a systemic therapy. It uses drugs that are delivered into the bloodstream to reach and destroy cancer cells throughout the body.
Chemotherapy for ovarian cancer is administered:
Most women with stage I, II, and IV ovarian cancer receive intravenous chemotherapy. Women in stage III may receive a combination of intravenous and intraperitoneal chemotherapy. Side effects are more severe with intraperitoneal chemotherapy than when intravenous chemotherapy is used alone. However, the combination therapy can be very effective for women with later-stage cancer.
Clinical trials investigating new drugs and combinations of drugs are available for all stages of ovarian cancer. Discuss with your oncologist whether you may be an appropriate candidate for a clinical trial.
Initial chemotherapy regimens commonly use a combination of:
Paclitaxel and docetaxel are taxane drugs. Carboplatin and cisplatin are platinum-based drugs. Carboplatin causes fewer side effects than cisplatin, and in general is easier to administer and better tolerated.
Drug Therapy for Resistant or Recurred Cancer: Some ovarian tumors are resistant to platinum drugs. In other cases, the cancer returns (recurs) after treatment. There are many different drug therapy approaches to treating resistant or recurrent cancer.
A different platinum chemotherapy drug, a new type of drug, or different combinations of drugs may be tried. Some of these drugs include gemcitabine, doxorubicin, and topotecan.
Bevacizumab (Avastin) is a biologic drug used in targeted therapy. It blocks a protein that helps blood vessels form. By targeting this protein, the drug slows the growth of cancer cells. Bevacizumab is approved to treat platinum-resistant or recurrent epithelial ovarian cancer. It is given by IV in combination with paclitaxel, pegylated liposomal doxorubicin (Doxyl), or topotecan.
Hormone therapy may be an option for women with recurrent cancer who cannot tolerate or who has not been helped by chemotherapy. Hormone therapy drugs include:
Some of these drugs are given by injection; others are taken orally as a pill.
Chemotherapy drugs are given in cycles. You will receive an infusion of the drugs over the course of several days, followed by a rest period of several weeks, and then another cycle of infusion. The treatment is given in an outpatient clinic.
A chemotherapy infusion usually lasts about 3 to 6 hours. Treatment may be repeated every 3 weeks for a total of 6 cycles. Other dose schedules may require weekly treatment. The exact length of cycles varies depending on which drugs are used.
Side effects occur with all drugs and vary depending on the drug used. Side effects are more severe with higher doses and increase over the course of treatment. Most side effects go away after treatment is completed, but some may be long-lasting.
Common side effects may include:
Serious side effects may include:
Some side effects can sometimes be treated or prevented with drugs or non-drug therapies. For example, yoga and acupuncture may be helpful for easing fatigue. Discuss with your cancer care team strategies to help you cope.
Cancer support groups can help ease the stress of illness. Sharing with others who have common experiences and problems can help you not feel alone.
Radiation therapy is not typically used as a primary treatment for ovarian cancer. Radiation is sometimes used to as palliative treatment to help ease symptoms in recurrent ovarian cancer.
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Last reviewed on: 12/26/2014
Reviewed by: Howard M. Goodman, MD, Gynecological Oncology, Florida Cancer Specialists & Research Institute, West Palm Beach, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team. Author: Julia Mongo, MS.