Endometrial cancer

Endometrial cancer is the most common cancer that affects the female reproductive organs. In the US ~61,092 cases are diagnosed annually.

scientist looking through microscope.

What is endometrial cancer?

  • Endometrial cancer is found in the inner lining of the uterus, known as the endometrium. 1

  • It is the most common type of cancer that affects the female reproductive organs in the US.2

  • Approximately 61,092 new cases of endometrial cancer are expected to be diagnosed in the US this year.2

What are the signs and symptoms of endometrial cancer?

The most common symptoms of endometrial cancer are:3

  • Abnormal vaginal bleeding

  • ~90% of people with endometrial cancer will experience abnormal vaginal bleeding such as a change in periods, bleeding between periods, or bleeding after menopause.

  • Non-bloody vaginal discharge

Additional common late-stage symptoms of endometrial cancer include:3

  • Pelvic pain

  • Feeling a mass

  • Weight loss without trying

What is the unmet need in endometrial cancer?

  • The majority of people who have endometrial cancer are diagnosed early and are cured with surgery.4

  • However, for those whose disease recurs after platinum-based chemotherapy, there are limited treatment options.5

  • Approximately 1 in 4 people with endometrial cancer experience a recurrence or are diagnosed with advanced disease each year.6

  • Endometrial cancer has the highest rate of mismatch repair deficiency (dMMR) among tumor types,7 at approximately 25%,8 and increased rates of recurrence have been reported for some people with dMMR endometrial cancer9resulting in an unmet need for expanded treatment options.

  • In normal cells, Mismatch Repair (MMR) corrects errors that are introduced during DNA replication via enzymes. Under normal conditions, the enzymes as part of the MMR system restore DNA integrity by detecting and fixing the erroneous strands.10

  • When this process is defective it is known as Mismatch Repair Deficient (dMMR). dMMR is the result of the enzymes no longer functioning properly, leading to errors in the DNA that go unchecked.10,11

  • A dMMR system may result in the accumulation of these errors and may lead to cancer.11

How is endometrial cancer diagnosed?

  • Endometrial cancer is usually diagnosed after a person visits their doctor due to a variety of abnormal symptoms. Pelvic examination, ultrasounds, CT scans, MRIs and endometrial tissue sampling may all be used to diagnose endometrial cancer.12

Who is at increased risk for endometrial cancer?

  • Certain risk factors can increase the likelihood that a person will develop endometrial cancer, such as obesity, things that affect hormone levels, age, diet and exercise, type 2 diabetes, family history, past history of breast or ovarian cancer, treatment with radiation therapy to the pelvis and past history of endometrial hyperplasia.13
Our Way Foward logo

Our Way Forward

Our Way Forward is a call-to-action that encourages people living with gynecologic cancers, such as ovarian and endometrial cancer, their loved ones, and healthcare providers to rethink how they talk about these cancers. The program provides ways to learn from each other’s cancer experiences and to help navigate the physical and emotional challenges that these diseases bring. 

Learn more and visit our oncology homepage.


  1. American Cancer Society. What is Endometrial Cancer? www.cancer.org/cancer/types/endometrial-cancer/about/what-is-endometrial-cancer.html. Accessed April 2024.
  2. American Cancer Society. Key Statistics for Endometrial Cancer. Accessed April 2024https://www.cancer.org/cancer/types/endometrial-cancer/about/key-statistics.html
  3. Signs and Symptoms Of Endometrial Cancer. American Cancer Society. https://www.cancer.org/cancer/endometrial-cancer/detection-diagnosis-staging/signs-and-symptoms.html. Last updated March 27, 2019. Accessed April 2024.
  4. Cancer Facts & Figures 2024. American Cancer Society. Accessed April 2024https://www.cancer.org/content/dam/cancer-org/research/cancer-facts-and-statistics/annual-cancer-facts-and-figures/2024/2024-cancer-facts-and-figures-acs.pdf
  5. Burke WM, Orr J, Leitao M, et al. Endometrial Cancer: a review and current management strategies: part II. Gynecol Oncol. 2014;134(2):393-402.
  6. CancerMPact® Patient Metric, Kantar. Accessed April 2024cancermpact.com.
  7. Le DT, Durham JN Smith KN, et al. Mismatch repair deficiency predicts response of solid tumors to PD-1 blockade. Science 2017;357(6349):409-413.
  8. Lorenzi M, Amonkar M, Zhang J, et al. Epidemiology of microsatellite instability high (MSI-H) and deficient mismatch repair (dMMR) in solid tumor: a structured literature review. Journal of Oncology 2020; Article ID 1807929
  9. Backes FJ, Haag J, Cosgrove CS, et al. Mismatch repair deficiency identifies patients with high-intermediate risk (HIR) endometrioid endometrial cancer at the highest risk of recurrence: a prognostic biomarker. Cancer 2019;125(3):398-405.
  10. Microsatellite Instability – Defective DNA Mismatch Repair: ESMO Biomarker Factsheet. Retrieved May 2023, from https://oncologypro.esmo.org/education-library/factsheets-on-biomarkers/microsatellite-instability-defective-dna-mismatch-repair (ESMO p1 [DNA mismatch repair] lines 1-2).
  11. Mismatch Repair Deficiency – NCI Dictionaries. Accessed April 2024, from https://www.cancer.gov/publications/dictionaries/cancer-terms/def/mismatch-repair-deficiency
  12. Tests for Endometrial Cancer. American Cancer Society. https://www.cancer.org/cancer/endometrial-cancer/detection-diagnosis-staging/how-diagnosed.html. Last updated April 22, 2021. Accessed April 2024.
  13. Endometrial Cancer Risk Factors. American Cancer Society. https://www.cancer.org/cancer/endometrial-cancer/causes-risks-prevention/risk-factors.html.  Last updated March 27, 2019. Accessed April 2024.