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What is Endometrial Cancer?
Endometrial cancers are malignant tumors that originate in the endometrium, the tissue that lines the uterus. Endometrial cancer is the second most common gynecologic cancer affecting women worldwide and the most common gynecologic malignancy in the United States. It affects about 3% of women in the United States. Endometrial cancers are most commonly diagnosed in women between the ages of 60-70 years old and are strongly associated with obesity. When caught early, many types of endometrial cancers are highly treatable.
Endometrial cancers are malignant tumors that originate in the endometrium, the tissue that lines the uterus. The uterus is a small, pear-shaped organ in a female's pelvis, and is where a fetus develops and grows. These tumors account for the majority (>90%) of uterine cancers, with the remainder arising from uterine muscle tissue (see uterine sarcoma section).[see References: 1] They encompass a wide variety of different types of tumors - including endometrioid adenocarcinomas, carcinosarcomas, clear cell carcinomas, and mucinous carcinomas - and are classified by their appearance under a microscope, characterized by how abnormal the cells look (their histology) and how aggressive they are (as described by “grade”).
Endometrial cancer is the second most common gynecologic cancer affecting women worldwide and the most common gynecologic malignancy in the United States. It affects about 3% of women in the United States.[2, 3] The American Cancer Society estimates that in 2024, approximately 68,000 new cases will have been diagnosed, with the number of cases rising by approximately 2-3% annually over the last decade. Most patients are diagnosed with a favorable histology, meaning that the cancer is less aggressive (lower grade), and at an early stage (has not spread). Therefore, most patients have an excellent prognosis with a 5-year survival rate of up to 95%. However, the prognosis for long-term survival decreases with more aggressive tumor types, the presence of distant metastases, or recurrence.
Endometrial cancers are most commonly diagnosed in women between the ages of 60-70 years old and are strongly associated with obesity. Some cases can also be caused by inherited genetic conditions, such as Lynch syndrome, which also increases the risk of developing colon cancer. Recent advancements in understanding the genetic and molecular changes behind endometrial cancer have helped doctors better tailor treatments and predict outcomes, leading to more personalized care for patients.
When caught early, many types of endometrial cancers are highly treatable. Most cases will be treated with some form of surgery, and for those with evidence of spread throughout the abdomen, cytoreductive surgery (CRS) may be a viable treatment option. While there is limited data on the addition of hyperthermic intraperitoneal chemotherapy (HIPEC) to CRS, there may be a survival benefit of CRS/HIPEC for the most advanced-stage cases, especially in the first 1-2 years.

Risk Factors
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Obesity: the strongest risk factor and linked to hormone changes
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Age: Endometrial cancer affects mostly post-menopausal women, with an average age of diagnosis of 60 years
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Race: Endometrial cancer is more common in black women
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Type II diabetes
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Menopausal hormone therapy / Hormone-replacement drugs after menopause
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Tamoxifen use
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Family history of endometrial or colorectal cancer
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History of endometrial hyperplasia
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History of breast or ovarian cancer
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History of radiation therapy to the pelvis for another cancer
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Genetic factors like Lynch syndrome

Signs & Symptoms
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Post-menopausal bleeding
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Abnormal uterine bleeding/spotting (i.e.. heavy, irregular, bleeding between periods)
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Pelvic pain
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Pelvic mass
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Unintentional weight loss

Evaluation
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Physical exam
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Imaging studies: pelvic ultrasound, CT scan, MRI scan
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Blood work to include tumor markers
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Endometrial tissue sampling: endometrial biopsy (EMB); hysteroscopy/dilation and curettage (D&C)
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Surgical biopsy of metastatic tumor: fine needle biopsy, diagnostic laparoscopy
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Testing of abdominal fluid (ascites)
Key Facts
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Endometrial cancers are the most common gynecologic malignancy in the United States and are largely hormonally driven.
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Endometrial cancers are categorized into low-risk and high-risk groups based on histology, stage, and grade. This categorization is based on the surgical pathology and molecular analysis of the tumor and will guide treatment decisions and prognosis.
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The main treatment for endometrial cancer is surgery, which will include a hysterectomy (a removal of the uterus) and usually a bilateral salpingo-oophorectomy (removal of both the fallopian tubes and ovaries), and lymph node sampling. Other complementary therapies include radiation, systemic chemotherapy, immunotherapy, and hormone therapy.
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With recent evidence demonstrating a significant survival benefit, there has been a shift away from palliative systemic chemotherapy and towards cytoreductive surgery (CRS) as the primary treatment option for patients with metastatic endometrial cancer. The survival benefit is greatest with a complete cytoreduction.
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While there is limited data on the addition of HIPEC to CRS, a meta-analysis analyzing all available data concluded that there is likely a survival benefit of CRS/HIPEC, especially in the first 1-2 years, compared to CRS alone. Recommendations for CRS/HIPEC in this population are currently based on ovarian cancer guidelines.
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There are many emerging treatment options for endometrial cancers, which are discussed below. Ask your care team, which may include a gynecologic oncologist, surgical oncologist (specializing in peritoneal surface malignancies), radiation oncologist, and/or a medical oncologist, about which options are best for you.
Diagnosis and Prognosis
The prognosis of endometrial cancer largely depends on whether the cancer is classified as low-risk or high-risk.[9] Patients with low-risk endometrial cancer have an excellent prognosis, with a survival rate of over 90% and a low risk for recurrence.[29, 31] Women with low-intermediate-risk endometrial cancer also have an excellent prognosis, with recurrence rates of 5-6% without any additional therapy.[32] In contrast, patients with high-intermediate-risk endometrial cancers have a 30% risk of recurrence if no adjuvant therapy is used. However, this risk decreases to only 5% when adjuvant radiation is given. Regardless, overall survival remains >80% with or without radiation.[33] In high-risk endometrial cancer, the risk of disease progression and death is higher, and prognosis is highly dependent on histologic subtype, stage, and grade, which is further discussed below.[34]
Endometrioid Carcinoma
Endometrioid carcinoma is the most common type of endometrial cancer, accounting for 75-80% of cases.[35] Since it is by far the most common type, the majority of endometrial cancer research and guidelines are based on this subtype. Most of these cancers are low-grade (tumor grade 1 or 2), diagnosed early, and have a good prognosis, with survival rates as high as 80-90%.[36] Therefore, surgery is often the only treatment recommended for this subtype. However, a small number are grade 3 or have a p53 molecular alteration, which is linked with a poorer prognosis. In fact, grade 3 endometrioid carcinomas have been found to have similar survival and recurrence rates to serous and clear cell carcinomas, with 5-year overall survival rates of around 50%.[37, 38] Because of this, additional chemotherapy and/or radiation is recommended with surgery to help delay recurrence.
Serous & Clear Cell Carcinomas
Serous endometrial cancer is the second most common type of endometrial cancer, accounting for about 10% of cases, while clear cell carcinoma makes up <5%.[39, 40] Both of these subtypes are more aggressive than endometrioid carcinoma and are often diagnosed at a later stage, with 50-70% of serous carcinoma cases presenting with extrauterine spread. Overall survival for serous and clear cell carcinomas are similar, with estimated 5-year survival rates of 55% and 68%, respectively, and are strongly correlated with stage.[41] For serous carcinoma, survival ranges from 92% in stage I disease to only 17.3% at stage IV. Regardless of stage, achieving a complete cytoreduction is the most important prognostic factor. In advanced stages (stage III/IV), patients with optimal cytoreduction had a median overall survival of 51 months compared to only 12 months for those with residual disease.[42] Adjuvant chemotherapy with radiation may also improve survival after complete cytoreduction, though data is limited.[43] Due to the rarity, recommendations are often generalized from ovarian cancer studies given the similar tumor type.
Other Rare Endometrial Cancer Subtypes
Other rare endometrial cancer subtypes include mixed carcinomas, undifferentiated/dedifferentiated carcinoma, and carcinosarcomas. These subtypes are generally not well understood, with undifferentiated/dedifferentiated carcinomas being the least studied.44, 45 As the name suggests, mixed carcinomas have at least two distinct histologic components, typically endometrioid and another non-endometrioid type like serous or clear cell. Carcinosarcomas also have mixed histology, but include both a carcinoma and sarcoma component. These subtypes tend to be more aggressive than endometrioid carcinomas with worse survival seen in more advanced stages. For example, in carcinosarcoma, 5-year survival rates were 59% for stage I/II disease, but only 9% for stage IV.[46] Due to the limited data and poor prognosis, clinical trial enrollment is often recommended for these patients
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