Surgery for Uterine Cancer
Surgery for uterine cancer is performed in order to remove the cancer and learn additional information about the stage or extent of spread of the cancer. A surgeon who specializes in treatment of disorders of the female reproductive tract is known as a gynecologist. Gynecologic oncologists are gynecologists who have special training in treatment of cancers of the female reproductive tract. Gynecologic oncologists have developed expertise in performing surgical treatment of uterine cancer.
The standard surgery for treatment of uterine cancers is a total abdominal hysterectomy (removal of the uterus) and bilateral salpingo-oophorectomy (removal of the fallopian tubes and ovaries). In addition to removing the uterus and ovaries, the surgeon will often sample or remove the pelvic and para-aortic lymph nodes to determine if cancer has spread.
Dilation and Curettage
Dilation and curettage (D&C) is a common diagnostic procedure used by gynecologists to obtain tissue from the wall of the uterus. During a D&C, the vagina is washed with an antiseptic and a local anesthetic is injected into or near the cervix. Injectable painkillers or general anesthesia can also be used. The opening of the cervix is gradually stretched. One after the other, a series of increasingly thick rods (dilators) are inserted into the cervical opening. The thickest dilator may be the width of a fountain pen. As an alternative, absorbent dilators can be used to stretch the cervical opening. These dilators absorb fluids from the cervical area and stretch the opening of the cervix as the dilators expand. Scraping (curetting) the lining of the uterus yields tissue, which can then be looked at under the microscope to determine if cancer is present. Rarely, if ever, is curettage used for the treatment of uterine cancer since only a superficial layer of the uterus is removed.
Hysterectomy and Pelvic Lymph Node Dissection
The standard treatment of stages I – III uterine cancer is a total abdominal hysterectomy (removal of the uterus) and bilateral salpingo-oophorectomy (removal of the fallopian tubes and ovaries) with or without removal of the pelvic and para-aortic lymph nodes. When the uterus is surgically removed, the cut ends of the vagina are surgically sewn together forming what is termed a “vaginal cuff”. The vaginal cuff is a site of local cancer recurrence following surgery alone.
A hysterectomy is most effective if the exploration during surgery shows the cancer has not spread beyond the uterus. Some patients, however, will have cancer that has spread outside the uterus into the lymph nodes in the pelvis. Before the hysterectomy is done, the doctor will sometimes perform a pelvic lymph node dissection. During a pelvic lymph node dissection, the surgeon removes lymph nodes to determine whether they contain cancer. If the lymph nodes contain cancer, the surgeon may not proceed with the hysterectomy. Another form of treatment, usually radiation therapy and chemotherapy, is generally recommended.
Despite the surgical removal of the uterine cancer, some patients may experience recurrence of their cancer. It is important to realize that some patients with uterine cancer already have small amounts of cancer that have spread outside the uterus and were not removed by surgery. These cancer cells cannot be detected with any of the currently available tests. Undetectable areas of cancer outside the cervix are referred to as micrometastases. The presence of these microscopic areas of cancer causes recurrence following the initial treatment. External beam radiation therapy with or without implant radiation and chemotherapy are often recommended to cleanse the body of micrometastases in order to improve the cure rate achieved with surgical removal of the cancer.
“Debulking” Surgery for Inoperable Cancer of the Uterus
When the cancer cannot be completely removed, an appropriate question to ask is whether surgical removal of as much cancer as possible is beneficial. This is referred to as a “debulking surgery”, and is often performed so that radiation therapy and/or chemotherapy will have fewer cancer cells to kill. This, however, is major surgery and has many potential complications. The value of debulking surgery has not been clearly demonstrated in controlled clinical studies. However, researchers have evaluated the outcomes of women with advanced uterine cancer who underwent debulking surgery. Patients with less than 2 centimeters of cancer remaining after debulking surgery were compared to patients who had more than 2 centimeters of cancer remaining and patients who did not undergo debulking surgery. The average survival for optimal surgical debulking (less than 2 cm remaining) was 32 months, compared to 12 and 13 months for women with inadequate or no debulking. Thus, there may be a role for surgically removing as much cancer as possible in women with widespread uterine cancer.
Role of Para-aortic Lymphadenectomy
When uterine cancer spreads, it leaves the uterus and travels into lymph nodes in the pelvis near the uterus. From the pelvic lymph nodes it spreads to lymph nodes around the main artery from the heart called the aorta. These lymph nodes are called para-aortic lymph nodes.
During surgery, the pelvic lymph nodes are often removed, but the value of removing the para-aortic lymph nodes is less clear. If removal of para-aortic lymph nodes improved the chance of cure and/or prolonged survival, it would be beneficial. On the other hand, if para-aortic lymph node removal merely increases the side effects of surgery, it would be unadvisable.
Surgeons have attempted to evaluate whether para-aortic lymph node removal is beneficial. In a clinical study of 137 women at high-risk for para-aortic lymph node involvement, the cancer recurrence rate was 38% and the 5-year survival rate was 71% for those who did not have lymph nodes removed, compared to a recurrence rate of 23% and survival of 85% for those who did have lymph nodes removed. These doctors suggest that patients at high risk for lymph node spread should consider surgical removal of the para-aortic lymph nodes as well as the pelvic lymph nodes.
Side Effects of Surgery
Women undergoing a hysterectomy may experience lower abdominal incisional pain, bleeding or infection after the operation because it may reduce the risk of cancer recurrence and prolong survival. Difficulty with urination or problems with bladder control can also occur in women treated with surgery. Less commonly, injury to the rectum or tubes which drain the kidneys (ureters) or bladder occurs. This may be in the form of a “fistula” or abnormal connection to the vagina. For women of childbearing age, the effects of surgery are drastic, since the uterus and both ovaries are removed. Obviously, such surgery precludes childbirth. In addition, the removal of both ovaries precipitates menopause and the need for consideration of hormone replacement.
Surgical removal of the pelvic or para-aortic lymph nodes may cause lower-body lymphedema in some women. Lymphedema is the buildup of lymph fluid in the tissues just under the skin, resulting in swelling, tightness and discomfort in the affected part of the body. Damage to or blockage of the lymph system is the cause of lymphedema.
Strategies to Improve Treatment
The progress that has been made in the treatment of uterine cancer has resulted from improved development of treatments in patients with more advanced stages of cancer and participation in clinical trials. Future progress in the treatment of uterine cancer will result from continued participation in appropriate clinical trials. Currently, there are several areas of active exploration aimed at improving the treatment of uterine cancer.
Supportive Care: Supportive care refers to treatments designed to prevent and control the side effects of cancer and its treatment. Side effects not only cause patients discomfort, but also may prevent the optimal delivery of therapy at its planned dose and schedule. In order to achieve optimal outcomes from treatment and improve quality of life, it is imperative that side effects resulting from cancer and its treatment are appropriately managed. For more information, go to Supportive Care.
Laparoscopic Surgery for Uterine Cancer: A laparoscope is a lighted tube inserted through the skin into the abdomen that allows the surgeon to visualize, photograph and sample tissue for examination under the microscope. Some surgical procedures including hysterectomy and pelvic and para-aortic lymphadenectomy can be performed laparoscopically, obviating the need for an abdominal incision. This may reduce complications of surgery, especially in obese women. The Gynecologic Oncology Study Group is currently performing a clinical trial that directly compares laparoscopic hysterectomy to the standard technique involving an abdominal incision in order to evaluate which procedure is most beneficial.
Role of Para-Aortic Lymph Nodes Dissection: Currently, the routine removal of para-aortic lymph nodes is not agreed upon. Although some uncontrolled clinical trials suggest removal of para-aortic lymph nodes prolongs survival, other trials are ongoing to define the role of para-aortic lymph node dissection.