Endometrial cancer (also referred to as corpus uterine cancer or corpus cancer) is the most common female genital cancer in the developed world, with adenocarcinoma of the endometrium the most common type.[1] In the United States, an estimated 2.8% of women will be diagnosed with this malignancy at some point in their lifetime.[2]
Approximately 75% of women with endometrial cancer are postmenopausal. Thus, the most common symptom is postmenopausal bleeding.
For the 25% of endometrial cancers in patients who are perimenopausal or premenopausal, the symptoms suggestive of cancer may be subtler. The normal menstrual bleeding pattern during this period should become lighter and lighter and further and further apart. Heavy, frequent menstrual periods or intermenstrual bleeding must be evaluated.
See Clinical Presentation for more detail.
Examination in a woman with suspected endometrial carcinoma includes the following:
Once the diagnosis of endometrial cancer has been made, routine presurgical evaluation is performed to assess operability, including appropriate blood studies, electrocardiography, and chest radiography.
Imaging studies
Some investigators believe vaginal ultrasonography to evaluate the endometrial stripe should be the first diagnostic procedure, because vaginal ultrasonography is less invasive than endometrial biopsy. However, limitations to using the endometrial stripe as a criterion for further diagnostic tests (eg, endometrial biopsy) include false readings in the presence of several conditions (eg, endometrial polyp, obesity, diabetes, receiving tamoxifen).
Hydroultrasonography is used to ensure that it is not a false-positive result when the endometrium is thickened.
Procedures
The following procedures are used to determine the status of the endometrium:
See Workup for more detail.
Treatment of endometrial cancer is dependent on the stage of the disease and the patient’s surgical candidacy. In general, surgery is recommended.
Surgical intervention
Operative procedures used for managing endometrial cancer include the following:
Pharmacotherapy
Chemotherapeutic medications such as cisplatin can be used in the management of endometrial carcinoma.
See Treatment and Medication for more detail.
Corpus cancer is the most frequently occurring female genital cancer. In developed countries, adenocarcinoma of the endometrium is the most common gynecological cancer; however, in developing countries, it is much less common than carcinoma of the cervix.
Approximately 63,230 new US cases of endometrial cancer are expected to have been diagnosed in 2018 (3.6% of all new US cancer cases); of these women, approximately 11,350 will die from this disease (1.9% of all cancer deaths).[2] In the early part of the 20th century, cancer of the cervix killed more US women than any other cancer, but in the ensuing decades, the incidence for uterine cervical malignancy decreased precipitously. This decrease has been credited to the impact of screening with the Papanicolaou test (Pap smear). In less-developed countries, screening for cervical cancer is performed very infrequently, and therefore, cancer of the cervix is quite prevalent.
For patient education resources, see the Women's Health Center and Cancer Center, as well as Vaginal Bleeding and Cervical Cancer.
Multiple epidemiological risk factors have been identified in patients who have adenocarcinoma of the endometrium.
Obesity
Nulliparity
An individual who has had a late menopause (aged >52 y)
Unopposed estrogen, either as replacement therapy or endogenously produced (eg, granulosa cell tumor, polycystic ovarian disease), increases the risk of endometrial cancer.
Obesity is known to increase endogenous estrogen because the presence of fat appears to be responsible for the conversion of androstenedione to estrogen compounds at a much higher rate than if fat is not present.
Anovulation, which may be secondary to unopposed estrogen, also appears to contribute to this situation.
The most widely used anticancer drug is tamoxifen, and this drug has been suggested by some studies to cause an increased incidence of adenocarcinoma of the endometrium. These data were derived from retrospective analyses in which adenocarcinoma of the endometrium was not an end point in multiple prospective randomized studies evaluating the role of tamoxifen in patients with breast cancer. [3]
A case control study using the SEER database indicates that when confounding factors have been corrected, the risk of endometrial cancer does not appear to be increased in patients taking tamoxifen.[4] This study is very reassuring because the potential for an increased number of women taking tamoxifen is becoming apparent, particularly as the prophylactic role of tamoxifen has been recommended for high-risk women.
In contrast to tamoxifen, increasing data indicate that the use of combination oral contraceptives (OCs) decreases the risk of developing endometrial cancer.
Several studies have noted that women who use OCs at some time have a 0.5 relative risk of developing endometrial cancer compared with women who have never used OCs. This protection occurs in women who have used OCs for at least 12 months, and the protection continues for at least 10 years after OC use. Protection is most notable for nulliparous women.
Smoking apparently decreases the risk of developing endometrial cancer. The effects of smoking are related to body weight. Heavier women who smoke have the greatest reduction in risk.
Women who smoke are known to undergo menopause 1-2 years earlier than women who do not smoke.
Although smoking apparently reduces the risk of developing early stages of endometrial cancer, this advantage is strongly outweighed by the increased risk of lung cancer and other major health problems associated with smoking.
Some associated medical conditions have been found to increase the incidence of endometrial cancer. Breast, colon, and ovarian cancers are frequently observed in women with endometrial cancer.
Data suggest that women who have had breast cancer have a 2- to 3-fold increased risk of subsequently developing endometrial cancer.
Women who have hereditary nonpolyposis colon cancer (HNPCC) appear to have a markedly increased risk for developing endometrial cancer. Women with HNPCC account for only 2-10% of all female cases of colon cancer, but approximately 5% of all endometrial cancers occur in women with this risk factor. These women have a 27-60% lifetime risk of developing endometrial cancer, and the disease tends to occur at a younger age (46-54yo). The greatest risk of developing endometrial cancer in women with HNPCC occurs from age 40-60 years, at which time the absolute risk is greater than 1% per y.
Currently, no data indicate that annual screening of women with HNPCC will detect endometrial cancer at a sufficiently early stage to improve survival compared with those whose diagnosis is made when symptoms appear. Nevertheless, because of the high risk of endometrial cancer in these individuals and because of the potential life-threatening nature of this disease, HNPCC patients should be so informed and screening is certainly suggested. According to American Cancer Society guidelines, women with HNPCC should be offered screening with an endometrial biopsy by age 35 years.
Bjorge et al found that metabolic syndrome is associated with an increased risk of endometrial carcinoma and fatal uterine corpus cancer. Particularly in women with a high body mass index, the association appears to go beyond the risk conferred by obesity alone.[5]
Individuals with a family history of endometrial cancer appear to be at increased risk.
At one time, a classic phenotypic characteristic was thought to exist for a woman who would develop endometrial cancer. This phenotype included patients who were obese, nulliparous, and anovulatory in many instances. More recently, the existence of 2 pathogenic types of endometrial cancer was appreciated.
The first type occurs in women who fall into the classic category. These women are obese and have hyperlipidemia, signs of hyperestrogenism, uterine bleeding, infertility, and late onset of menopause. They may have hyperplasia of the ovary and endometrium. These patients tend to be white, obese, nulliparous, and have well-differentiated superficially invasive cancers that are sensitive to progesterone. They have a very favorable prognosis, and extrauterine disease is unusual in this group of patients. Fortunately, most women with endometrial cancer are in this category.
The second type occurs in women who have none of the disease states present in the classic presentation. These individuals tend to have poorly differentiated tumors, deep myometrial invasion, a high degree of metastasis to the lymph nodes and other sites, decreased sensitivity to progestins, and a poor prognosis. These patients tend to be thin, multiparous, and African American.
The most recent Surveillance, Epidemiology, and End Results (SEER) data are from 2011-2015 cases, which reveal a total age-adjusted incidence of 26 cases per 100,000 women.[2] The incidence in white women is 26.6 cases per 100,000 compared to the incidence in black women which is 25.4 cases per 100,000.[2]
Mortality is higher in black women (8.3 deaths per 100,000) than in white women (4.3 deaths per 100,000). Asian/Pacific Islander women have the lowest mortality (2.9% deaths per 100,000) among all races.
Endometrial adenocarcinoma occurs during the reproductive and menopausal years. The median age of women with this malignancy is 62 years; most patients are aged 55-64 years.[2]
Approximately 63,230 new US cases of endometrial cancer are expected to have been diagnosed in 2018 (3.6% of all new US cancer cases); of these women, approximately 11,350 will die from this disease (1.9% of all cancer deaths).[2] On the basis 2013-2015 data, an estimated 2.9% of women will be diagnosed with endometrial cancer in their lifetime.[2]
Multiple prognostic factors exist for endometrial cancer. These prognostic factors generally are related to surgical pathologic findings. As in all cancers, the stage of the disease is the most important prognostic factor. Obviously, the surgical procedure helps determine the stage. Listed below are prognostic factors that may relate specifically to the stage of the disease and, thereby, may affect overall survival.
Prognostic factors - histopathologic subtypes
Most endometrial carcinomas are endometrioid adenocarcinomas. Adenoacanthomas (benign squamous components) and adenosquamous carcinoma (malignant squamous components) make up the next largest category.
Clear cell and papillary serous adenocarcinomas represent approximately 10% of all endometrial cancers and are considered to be poor histopathologic subtypes. These latter subtypes tend to have deeply invasive myometrial involvement, and they have a propensity for extrauterine spread, even though the myometrium may be superficially involved.
Previously, a patient with an adenosquamous carcinoma was thought to have a poor prognostic histotype because of the malignant squamous component.
Contemporary data suggest that irrespective of whether a squamous component is present (either benign or malignant), prognosis is related directly to the grade of the adeno component and not the fact that a squamous malignancy is present. If a malignant squamous component is present, a greater tendency exists for a more poorly differentiated adeno component to be present.
More recently, considerable evidence suggests that carcinosarcomas (CS) are not true sarcomas, as it appears they are derived from an epithelial origin. As a result CSs are now considered as a subset of endometrial cancers (type 2).[6]
The degree of histologic differentiation of endometrial cancer has long been accepted as a sensitive indicator of prognosis. Patients with well-differentiated adenocarcinomas tend to have involvement of the endometrium or superficial myometrium, and extrauterine disease is unusual.
However, if a poorly differentiated lesion is present, these cancers tend to be much more aggressive, involving significant myometrial invasion, and often have extrauterine metastasis, either with positive peritoneal cytology, retroperitoneal spread, or involvement of the pelvic and/or para-aortic lymph nodes.
Because papillary and clear cell carcinomas are associated with a relatively poor prognosis, these subtypes are not usually graded but are considered in the same category as a poorly differentiated cancer.
Myometrial invasion
The degree of myometrial invasion continues to be a consistent indication of tumor virulence. As the depth of myometrial invasion increases, the chance of having extrauterine disease is greater.
As noted above, grade and depth of invasion, as a generalization, are interrelated. As the grade of the tumor increases, an increase usually occurs in the depth of myometrial invasion; however, exceptions exist in that a grade 1 lesion can have deep myometrial invasion and a grade 3 lesion can be limited to the endometrium.
When grade and depth of invasion are evaluated separately, the depth of invasion appears to be a more important prognostic factor than the grade of the tumor.
Peritoneal cytology
Cytologic evaluation of the peritoneum appears to be an important prognostic factor. Although no universal agreement has been reached about the significance of cytologic evaluation findings, the vast majority of data in the literature suggest that they represent an independent prognostic factor.
Cytologic evaluation findings also appear to correlate with other prognostic factors, such as depth of myometrial invasion and lymph node metastasis.
The FIGO staging system states that positive cytology should be reported separately without changing the stage. If ascitic fluid is not present at the time of the exploratory laparotomy, a saline lavage of the pelvis and lower abdomen is performed and the specimen is submitted for cytologic evaluation.
Lymph node metastasis
A considerable number of patients who were thought to have clinical stage I endometrial cancer were, in fact, found to have lymph node metastasis when histopathologic evaluation was performed on the lymph nodes.
Again, a correlation among multiple prognostic factors has been shown to be present. Patients with poorly differentiated cancers, papillary serous and clear cell carcinomas, deep myometrial invasion, positive peritoneal cytology, or adnexal metastasis tend to have an increased risk of having lymph node metastasis.
Subsequent therapy after primary surgery depends on prognostic factors and spread of the disease. If the disease is limited to the uterus, surgery appears to be adequate treatment, with the possible exception of patients who have poorly differentiated deeply invasive myometrium. In these patients, data suggest that, possibly, postoperative irradiation may be of benefit. In patients who have disease outside of the uterus, radiation therapy may be effective; however, this has not been evaluated in a prospective randomized study. Most investigators irradiate the appropriate area if lymph node metastasis is present.
In patients with advanced disease (ie, intraperitoneal disease, disease outside of the peritoneal cavity), systemic chemotherapy may be of benefit. Studies suggest that carboplatin and paclitaxel are the drugs of choice when systemic chemotherapy is needed.
According to the SEER database, the 5-year survival rate for Uterine Cancer from 2008-20014 was 81.1%. The survival by stage for Uterine Cancer from 2008-2014 was[47] :
Increasingly, data suggest that lymphvascular space involvement in the myometrium predicts extant disease and a poor prognosis. Whether the poor prognosis remains when other prognostic factors are evaluated is less well defined.
L1CAM
A study found expression of the cell adhesion molecule L1CAM in early stage endometrial tumors to be a strong predictor of cancer recurrence. In a retrospective analysis of L1CAM expression in 1021 paraffin-embedded specimens of stage I, type I endometrial cancer, researchers found that 17.7% of the specimens were positive for L1CAM and that during a median follow-up of 5.3 years, recurrence rates were 51.4% among the L1CAM-positive cases, compared with just 2.9% among L1CAM-negative cases. Median overall survival was 8.9 years in patients with L1CAM-positve tumors, whereas median survival had not been reached in the L1CAM-negative patients.[7, 8]
In the study, L1CAM had sensitivities of 0.74 for recurrence and 0.77 for death, and specificities of 0.91 and 0.89, respectively. These data suggest that L1CAM is the best prognostic factor in stage I, type I endometrial cancer so far published.
Complications that may occur from therapy include complications that are normally expected from the surgical procedure itself. Because a lymphadenectomy is performed, increased bleeding could develop; however, unique complications from the procedure do not usually occur.
Postoperative complications can be expected, depending on the preoperative clinical condition of the patient. As noted previously (see Causes), many of these patients have comorbidities such as hypertension, obesity, diabetes, and increased age.
One postoperative complication that may be somewhat more common is thromboembolism because this is increased in patients who have cancer, are obese, and are older. In current practice, most physicians use some type of prophylaxis, either external pneumatic compression, low-dose heparin or a combination of the two.
Because approximately 75% of women with endometrial cancer are postmenopausal, the most common symptom is postmenopausal bleeding.
Investigate all bleeding during menopause unless the patient is on cyclic replacement therapy with normally anticipated withdrawal bleeding. The duration or amount (staining vs gross) of bleeding does not make any difference.
The fact that only approximately 20% of postmenopausal bleeding is due to cancer is appreciated, but obviously, the diagnosis must be eliminated in these patients.
Because 25% of endometrial cancers are in patients who are perimenopausal or premenopausal, symptoms suggestive of cancer may be more subtle. The idea that any type of bleeding during the perimenopausal period is probably due to menopause is a common misconception. This irregular bleeding is often ignored by the patient and even health care providers. Remember that the normal bleeding pattern during this time should become lighter and lighter and further and further apart. Heavy frequent menstrual periods or intermenstrual bleeding must be evaluated.
Because bleeding usually occurs from the endometrium, pelvic examination findings may be entirely normal, with no gross evidence of disease on the cervix and with a normal-sized uterus. Note the following:
Some investigators believe that this should be the first diagnostic procedure because vaginal ultrasonography is less invasive than endometrial biopsy.
One of the difficulties with using the endometrial stripe as a criterion for further diagnostic tests (eg, endometrial biopsy) is that several conditions may be present that yield a false reading on the endometrial stripe. This is particularly true in a patient who might have an endometrial polyp, is obese or diabetic, or who has been taking tamoxifen.
If a thickened endometrium is present, obtain a hydroultrasonogram to make sure a false-positive result is not present. This is accomplished by placing a small volume of saline into the endometrial cavity and then repeating the vaginal ultrasonogram.
Another problem that arises is that the thickness of the endometrium can vary considerably depending on different factors. The thickness of the endometrium depends on whether or not the patient is obese or diabetic, whether she is perimenopausal or postmenopausal (and for how long), whether she is taking hormone replacement therapy, and whether the therapy includes estrogen alone or estrogen plus progesterone. Currently, no generally accepted guidelines exist for each of these different clinical scenarios.
Endometrial biopsy
Although fractional dilatation and curettage was historically the definitive diagnostic procedure to help rule out endometrial cancer, in current practice endometrial biopsy as an office procedure is quick, well tolerated, and quite sensitive for making the diagnosis.
If endometrial pathology is not present on biopsy specimens and the patient has no further bleeding, no additional diagnostic tests need to be performed.
If the patient continues to be symptomatic, then further evaluation of the endometrial cavity is necessary.
Hysteroscopically directed biopsy
Another diagnostic procedure that has been advocated by some as an even more accurate way of determining the status of the endometrium is a hysteroscopically directed biopsy (see the video below); however, studies have shown that when results are compared with the histopathology, both false-positive and false-negatives results may be noted using this technique.
View Video | Diagnostic hysteroscopy for endometrial cancer. Video courtesy of Tarek Bardawil, MD. |
The current role of the formal dilatation and curettage is probably very limited because the diagnosis can usually be made in the office.
This may be necessary in patients who are bleeding and have a cervical os that is very stenotic. Anesthesia may be required to perform adequate dilatation for endometrial sampling.
Pathological diagnosis is obviously the criterion standard for evaluation of the endometrial cavity. A high index of suspicion must be maintained if a diagnosis of endometrial cancer is considered.
Endometrioid adenocarcinoma is the most common histopathologic subtype. A squamous component, either benign (adenocanthoma) or malignant (adenosquamous), does not affect prognosis, but the grade of the adeno component does affect prognosis. Papillary serous and clear cell histotypes confer a poor prognosis but, fortunately, are uncommon compared with adenocarcinoma. Secretory carcinomas are the least frequently occurring cancers and are associated with a good prognosis.
More recent data would suggest that mixed müllerian tumors originally thought to be a sarcoma are in actuality epithelial in origin and should be included here instead of as a primary sarcoma.
The International Federation of Gynecology and Obstetrics (FIGO), 2008 staging system for carcinoma of corpus uteri is as follows[11] :
Cases of carcinoma of the corpus should be classified (or graded) according to the degree of histologic differentiation. The histopathology and degree of differentiation is as follows:
* Either G1, G2, or G3.
** Endocervical glandular involvement only should be considered as Stage I and no longer as Stage II.
† Positive cytology has to be reported separately without changing the stage.
Standard management of endometrial cancer at diagnosis involves surgery, followed by chemotherapy and/or radiation therapy.[1] In the setting of recurrent disease, secondary cytoreduction has been associated with progression-free (PFS) and overall (OS) survival.[12] Prognostic factors for improved long-term OS were the absence of residual disease following surgical resection and histotype.[12]
Lymph node metastasis is an important concern in patients with high-risk early or advanced endometrial cancer.[13, 14] In evaluating data from 523 French surgical patients over a 12-year period, Bendifallah et al developed a predictive model to identify those at high risk for lymph node metastases using the histopathologic features of histologic grade, tumor diameter, depth of myometrial invasion, and status of lymphovascular space involvement.[13] In a different study, Fotopoulou et al reported that, on the basis of anatomic distribution of positive lymph nodes, when lymphadenectomy is performed for those with high-risk early or advanced disease, the procedure should contain pelvic and para-aortic areas up to the renal vessels to ensure accuracy in the evaluation of all potential positive nodes.[14]
Two randomized trials by Seagle et al examined the association of lymphadenectomy with overall survival in women with stage I endometrioid and node-negative, stage I to IIIB endometrial cancer. One study reported that performance of pelvic lymphadenectomy was associated with increased survival compared with no lymphadenectomy (5-year survival [95% CI], 91.4% [90.2% to 92.6%] v 87.3% [85.9% to 88.8%]; HR, 0.71 [95% CI, 0.64 to 0.78]; P< .001). This study also reported that the addition of para-aortic lymphadenectomy was associated with increased survival compared with pelvic lymphadenectomy alone (5-year survival [95% CI], 91.0% [89.8% to 92.2%] v 89.8% [88.4% to 91.1%]; HR, 0.85 [95% CI, 0.77 to 0.95]; P = .003).[15] Another study concluded that increased lymph node count is associated with a 1% to 14% decreased risk of death per each additional five lymph nodes removed and a 5% to 20% increased 5-year survival among women with pathologically node-negative endometrioid and serous endometrial cancers.[16]
Since 1988, FIGO, whose Gynecologic Oncology Committee was responsible for the staging of gynecological cancer, recommended that corpus cancer be staged surgically. Previously, clinical evaluation was used for staging, and multiple studies noted the inaccuracy of clinical staging compared with surgical pathological findings. Therefore, once the diagnosis of endometrial cancer has been made, routine presurgical evaluation is performed to assess operability.
Note the following:
A 2012 review found that for early stage primary endometrioid adenocarcinoma of the endometrium, laparoscopy and laparotomy are associated with similar rates of disease-free and overall survival and that laparoscopy is associated with reduced operative morbidity and shorter hospital stays.[18]
Guidelines Contributor: Jori S Carter, MD, MS Assistant Professor, Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Virginia Commonwealth University School of Medicine
Currently, no major organization recommends screening for cancer of the uterus for asymptomatic women. According to the National Cancer Institute (NCI) PDQ cancer information summary for endometrial cancer screening, no evidence suggests that transvaginal sonography reduces mortality from endometrial cancer, and there is inadequate evidence that endometrial sampling (biopsy) reduces mortality. The early clinical presentation and high early detection rate (85%) make it unlikely that screening will have a successful impact on earlier detection and increased survival rate.[19]
The American Cancer Society (ACS) recommends that at the time of menopause, all women should be made aware of the risks and symptoms of endometrial cancer and strongly encouraged to report any unexpected bleeding or spotting to their physician.[20]
Additionally, the NCI’s PDQ cancer information summary and ACS agree that for women at increased risk for endometrial cancer due to a history of receiving either estrogen therapy or tamoxifen therapy, there is no indication that routine screening would improve early detection or survival rates. As with women at average risk, these women generally present with symptoms at an early stage when the prognosis is good.[19, 20]
Women with Lynch syndrome (hereditary nonpolyposis colorectal cancer) have up to an 80% increased risk for colorectal cancer and a 60% increased risk for endometrial cancer.[21]
The National Comprehensive Cancer Network (NCCN) guidelines endorse universal immunohistochemistry (IHC) or microsatellite instability (MSI) testing, regardless of family history, on all individuals diagnosed with colorectal or endometrial cancers to identify which patients should have genetic testing for Lynch syndrome. In addition, Lynch syndrome genetic testing should be done for all women diagnosed with endometrial cancer before age 50 and family members of anyone with Lynch syndrome.[21]
The NCCN guidelines include the following recommendations for surveillance and risk reduction in women with Lynch syndrome:
In 2014, the American College of Obstetricians and Gynecologists (ACOG) and the Society of Gynecologic Oncology (SGO) published joint guidelines that recommend that all women who are diagnosed with endometrial cancer should be screened for Lynch syndrome. Genetic testing is preferred when resources are available, but clinical screening that includes focused family history is acceptable. Asymptomatic women with a first-degree relative diagnosed with either endometrial or colorectal cancer before age 60 should also be tested.[22]
The ACOG/SGO recommendations for surveillance and risk reduction include the following:
Consensus guidelines issued jointly by the European Society for Medical Oncology, the European Society of Gynaecological Oncology, and the European Society of Radiotherapy and Oncology (ESMO/ESGO/ESTRO) recommends annual surveillance by transvaginal ultrasound and biopsy starting from the age of 35 until hysterectomy for all Lynch syndrome mutation carriers. In addition, for management of women with Lynch syndrome, recommendations include[23] :
The NCI’s PDQ cancer information summary notes that the use of oral contraceptives containing estrogen and progesterone for at least 1 year reduces the risk for developing endometrial cancer. The decreased risk is proportionate to duration of use, and the benefit persists for at least 15 years after cessation. However, use of oral contraceptives is also associated with increased risk for blood clots, stroke, and myocardial infarction, particularly in women who smoke and are older than 35.[19]
The ACS recommends the following measures to reduce the risk of developing endometrial cancer[20] :
Women who are undergoing surgery for colorectal cancer and who do not wish to preserve fertility should be offered prophylactic hysterectomy and/or oophorectomy
The National Comprehensive Cancer Network (NCCN) guidelines provide the following recommendations for the initial evaluation for suspected endometrial cancer[24] :
The Society of Gynecologic Oncology (SGO) and European Society of Medical Oncology (ESMO) guidelines provide overall similar recommendations, but both include hysteroscopy with biopsy as another diagnostic option.[25, 26] Because of its high accuracy, the SGO considers hysteroscopy with biopsy the gold standard for diagnosis.[25]
The following two major staging systems are commonly used in endometrial cancer:
In the past, uterine sarcomas were staged as endometrial cancers. This did not reflect clinical behavior, however, so a new corpus sarcoma staging system was developed, based on the criteria used in other soft tissue sarcomas. See the Table below.
Table. Uterine Sarcomas (Leiomyosarcoma, Endometrial Stromal Sarcoma, and Adenosarcoma)
View Table | See Table |
Positive cytology is an adverse risk factor. Although peritoneal cytology results do not affect staging, FIGO and AJCC continue to recommend that peritoneal cytology be obtained and reported.[11, 27]
The European Society of Medical Oncology (ESMO) guidelines stratify patients into treatment groups based on the estimated risk of disease recurrence, as follows[26] :
The National Comprehensive Cancer Network guidelines use the following categories for delineating endometrioid cancer treatment groups[24] :
The major guidelines are in agreement that the primary treatment for stage I disease limited to the uterus is surgery (total hysterectomy and bilateral salpingo-oophorectomy) and complete surgical staging including pelvic washings, bilateral pelvic and paraaortic lymphadenectomy.[24, 25, 26, 28, 23]
The recommended surgical approach varies among the guidelines. The National Comprehensive Cancer Network (NCCN) considers that hysterectomy and adnexectomy may be performed through laparotomy, vaginally, or via minimally invasive techniques such as laparoscopy or robotic surgery.[24] The European Society for Medical Oncology, the European Society of Gynaecological Oncology, and the European Society of Radiotherapy and Oncology (ESMO/ESGO/ESTRO) recommends minimally invasive surgery because of the significant reduction in complications reported.[23]
The Society of Gynecologic Oncology (SGO) recommends laparoscopy as the standard approach, and finds robotic-assisted techniques acceptable. Both the American College of Obstetricians and Gynecologists (ACOG) and SGO reserve vaginal hysterectomy for selected women who are at high risk for surgical morbidity.[25, 28]
In younger women with noninvasive, grade 1 cancers who wish to preserve fertility, NCCN, SGO, and ACOG all recommend progestin therapy. Total hysterectomy and bilateral salpingo-oophorectomy is indicated when childbearing is complete, or sooner if cancer is still present after 6-9 months of therapy or disease progression occurs. Women receiving fertility-sparing treatment should be monitored closely with endometrial biopsy every 3 months.[24, 28, 29]
For patients who are medically inoperable, radiation therapy or hormone therapy are options, according to both the NCCN and ESMO/ESGO/ESTRO guidelines.[24, 23]
In 2014, the American Society of Radiation Oncology (ASTRO) published evidence-based guidelines for the role of postoperative radiation therapy. The recommendations include the following[30] :
The European Society of Medical Oncology (ESMO) and the Society of Gynecologic Oncology (SGO) offer similar recommendations for treatment of advanced and metastatic disease that include the following[29, 26] :
American College of Obstetricians and Gynecologists (ACOG) and European Society of Medical Oncology (ESMO) guidelines concur that following surgical treatment, patients should receive a pelvic exam every 3-4 months for the first 2-3 years, then every 6 months until year 5 to monitor for recurrent disease.[28, 26] The Society of Gynecologic Oncology (SGO) and the National Comprehensive Cancer Network (NCCN) recommend review of symptoms and pelvic exam every 3 to 6 months for the first 2 years and every 6 to 12 months thereafter.[24, 31]
ESMO and SGO guidelines prefer PET/CT over CT alone for assessment of suspected recurrence.[26, 31]
Primary tumor (T) TNM FIGO stages Surgical-pathologic findings TX Primary tumor cannot be assessed T0 No evidence of primary tumor T1 I Tumor confined to uterus T1a IA Tumor ≤5 cm T1b IB Tumor >5 cm T2a IIA Tumor extends to the pelvis, adnexal involvement T2b IIB Tumor extends to extra-uterine pelvic tissue T3a IIIA Tumor invades abdominal tissues, one site T3b IIIB Tumor invades more than one site T4 IVA Tumor invades bladder and/or rectum Regional lymph nodes (N) TNM FIGO stages Surgical-pathologic findings NX Regional lymph nodes cannot be assessed N0 No regional lymph node metastasis N1 IIIC Metastasis to pelvic and/or para-aortic lymph nodes Distant metastasis (M) TNM FIGO stages Surgical-pathologic findings M0 No distant metastasis M1 IVB Distant metastasis