Endometrial Cancer Recurrence in Patients Taking Metformin


Given the early literature available and its biological plausibility as an inhibitor of the mammalian target of rapamycin (mTOR) protein, it is hypothesized that women with endometrial cancer who take metformin for non-cancer related reasons have a lower cancer recurrence rate compared to women not taking metformin. The primary goal of this study is to determine whether metformin use is associated with a decrease in the rate of endometrial cancer recurrence. Secondary objectives are to assess whether women with endometrial cancer taking metformin have longer progression free survival and overall survival than those that do not take metformin.

Study Type

  • Study Type: Observational
  • Study Design
    • Time Perspective: Retrospective
  • Study Primary Completion Date: February 27, 2022

Detailed Description

This is a retrospective chart review study. Medical records are reviewed and data collected through the hospital's electronic medical record (EMR). Participants are women that had definitive treatment for endometrial cancer between 2017-2019 at WellSpan York Hospital Department of Gynecologic Oncology. Participants are identified and their chart reviewed for demographic data of age, race, comorbid conditions, and use of metformin. Possible confounding information is documented, including chemotherapy status, radiotherapy status, cancer and tumor type, grade, and stage, available genetics information, medications at the time of cancer diagnosis, and medication durations. Those patients who had cancer recurrence are identified. Recurrence data including type, time interval, additional treatment are collected. Recurrence is defined as any recurrence validated by clinical, imaging and histological data and can be identified based on the cancer registry. Recurrence rate in participants that took metformin vs. those that did not is calculated. Time to endometrial cancer recurrence is calculated. Progression free survival and overall survival are calculated. Statistical analysis is performed to compare each of these outcomes between participants who took metformin vs. those that did not.


  • Drug: Metformin use
    • As an observational study, this is past exposure to metformin that occurred during the study period

Arms, Groups and Cohorts

  • Metformin use
    • These participants were on metformin for any duration at any point in time in the study period
  • No metformin use
    • These participants were never on metformin for any duration at any point in time in the study period

Clinical Trial Outcome Measures

Primary Measures

  • Endometrial Cancer Recurrence
    • Time Frame: 2017-2019
    • This is the identification of whether metformin use is associated with endometrial cancer recurrence.

Secondary Measures

  • Progression Free Survival
    • Time Frame: 2017-2019
    • This is the identification of whether metformin use is associated with improved progression free survival of endometrial cancer.
  • Overall Survival
    • Time Frame: 2017-2019
    • This is the identification of whether metformin use is associated with improved overall survival of endometrial cancer.

Participating in This Clinical Trial

Inclusion Criteria

  • Participants with endometrial cancer of all histologies treated in the WellSpan system from 2017-2019 Exclusion Criteria:

  • Participants who underwent palliative treatment for endometrial cancer

Gender Eligibility: Female

Minimum Age: 18 Years

Maximum Age: 99 Years

Are Healthy Volunteers Accepted: Accepts Healthy Volunteers

Investigator Details

  • Lead Sponsor
    • WellSpan Health
  • Provider of Information About this Clinical Study
    • Principal Investigator: Eav Lim, Principal Investigator – WellSpan Health
  • Overall Official(s)
    • Eav Lim, DO, Principal Investigator, WellSpan Health-York Cancer Center


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