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Letrozole in Uterine Leiomyosarcoma

  • PhasePhase 2
  • StatusRecruiting
  • Planned enrollment40 people
  • Recruiting US sites34
  • SponsorGOG Foundation
  • RegistryNCT05649956

Recruitment re-checked on ClinicalTrials.gov Oct 30, 2026. Public record; not medical advice.

Letrozole in Uterine Leiomyosarcoma: a one-minute explainerNCT056499561 min

Eligibility

Who can join

The film gives the main points. The full list below is copied from the registry; the study team makes the final decision.

  • Age18 Years to no maximum
  • SexFemale
  • Healthy volunteersNo

You may be able to join if

  • Patient or a legally authorized representative must have signed an approved informed consent and authorization permitting the release of personal health information.
  • Patient must have histologically confirmed newly diagnosed uterine leiomyosarcoma with disease limited to the uterus (FIGO 2009 Stage I). Submission of pathology report documenting uterine leiomyosarcoma histology is required in the IRT Source Document Portal following randomization.
  • Patient tumors must express ER positivity by immunohistochemistry (ER expression greater than 10% by immunohistochemistry). ER status test results must be provided at enrollment. Sites are required to report results of ER status testing in the IRT Source Document Portal.
  • Patient must have completed hysterectomy and bilateral salpingo-oopherectomy no more than 12 weeks from enrollment.
  • All patients must have NO measurable disease as defined by RECIST 1.1 within 6 weeks of enrollment. Measurable disease is defined as at least one lesion that can be accurately measured in at least one dimension (longest diameter to be recorded). Each lesion must be greater than or equal to 10 mm when measured by CT, MRI or caliper measurement by clinical exam; or greater than or equal to 20 mm when measured by chest x-ray. Lymph nodes must be greater than or equal to 15 mm in short axis when measured by CT or MRI.
  • Patients must have an ECOG performance status of 0, 1, or 2.
  • Patients must have adequate organ and marrow function as defined below:
  • NOTE: Institutional/laboratory upper limit of normal = ULN Institutional/laboratory lower limit of normal = LLN
  • Bone marrow function:
  • Absolute neutrophil count (ANC) greater than or equal to 1500 cells/mcl
  • Platelet count greater than or equal to 100,000 cells/mcl
  • Hemoglobin greater than or equal to 9.0 g/dL (Patients may receive erythrocyte transfusions to achieve this hemoglobin level at the discretion of the Investigator. Initial treatment must not begin earlier than the day after erythrocyte transfusion).
  • Renal function:
  • Serum creatinine less than or equal to 1.5 x ULN
  • Hepatic function:
  • AST (aspartate aminotransferase) and ALT (alanine aminotransferase) less than or equal to 3.0 x ULN
  • Serum albumin greater than or equal to 2.5 g/dL
  • Patient must be at least 18 years of age.
  • Patient must be able to swallow oral medication.

You cannot join if

  • Exclusion Criteria 1. Patients who do not have pure uterine sarcomas (i.e., no mixed malignant mullerian tumors are permitted).
  • Patients with any other severe concurrent disease, which would make the patient inappropriate for entry into this study, including significant hepatic, renal, or gastrointestinal diseases.
  • Patients with concomitant invasive malignancy or a history of prior malignancy except non-melanoma skin cancer, in situ cervical cancer, or other cancer for which the patient has been disease-free for at least three years. Patients are also excluded if their previous cancer treatment contraindicates this protocol.
  • Patients who have a history of taking any aromatase inhibitor within the past 5 years.
  • Patients with active or uncontrolled systemic infection. 6. Patients with history of uncontrolled cardiac disease, i.e., uncontrolled hypertension (defined as systolic greater than 150 mm Hg or diastolic greater than 90 mm HR despite antihypertensive medications), unstable angina, recent myocardial infarction (within prior 6 months), uncontrolled congestive heart failure (NYHA Class II or greater), clinically significant cardiac arrhythmias, and cardiomyopathy with an ejection fraction under 40%.
  • Patients currently receiving chemotherapy or radiation therapy. 8. Patients with severe hepatic impairment and/or cirrhosis. 9. Patients with duodenal stent or other GI disorder/defect that would interfere with absorption of oral medication.
  • Patients deemed otherwise clinically unfit for clinical trial per investigators discretion.
  • Patients with known hypersensitivity to any of the excipients of letrozole. 12. Patients who are pregnant or breast-feeding. 13. Patients who are currently part of or have participated in any clinical investigation with an investigational drug within 30 days of prior to enrollment.
  • Patients currently using systemic estrogens, including herbals and supplements with estrogenic properties. The use of vaginal estrogen is permitted if symptoms are refractory to moisturizers and lubricants.

The treatment

How it is intended to work

This is how the treatment is meant to work. Whether it helps, and how safe it is, is what this trial is testing.

letrozole. A nonsteroidal inhibitor of estrogen synthesis with antineoplastic activity. As a third-generation aromatase inhibitor, letrozole selectively and reversibly inhibits aromatase, which may result in growth inhibition of estrogen-dependent breast cancer cells. Aromatase, a cytochrome P-450 enzyme localized to the endoplasmic reticulum of the cell and found in many tissues including those of the premenopausal ovary, liver, and breast, catalyzes the aromatization of androstenedione and testosterone into estrone and estradiol, the final step in estrogen biosynthesis. NCI Drug Dictionary

Treatments listed in the registry

  • Letrozole (Drug): Letrozole 2.5 mg PO daily

The study

Treatment groups

Randomized · Parallel · masking: None

Letrozole (Experimental)

Letrozole 2.5 mg orally

Observation (No Intervention)

Observation

Goals

What the study measures

Main goals

  • Progression Free Survival (Measured from time of enrollment until date of progression or death up 3 years from randomization)

Planned enrollment: 40 (estimated).

Where

Recruiting US sites

  • University of Colorado Cancer Center - Anschutz Cancer Pavilion, Aurora, Colorado
  • Highlands Ranch Hospital, Highlands Ranch, Colorado
  • Broward Health Medical Center, Fort Lauderdale, Florida
  • Mount Sinai Comprehensive Cancer Center, Miami Beach, Florida
  • Winship Cancer Institute, Emory Hospital, Atlanta, Georgia
  • Endeavor Health - Kellogg Cancer Center, Evanston, Illinois
  • Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indianapolis, Indiana
  • LSU Health Sciences Center, New Orleans, Louisiana
  • WK Physician Network-Gynecologic Oncology Associates, Shreveport, Louisiana
  • University of Massachusetts Memorial Medical Center, Worcester, Massachusetts
  • ProMedica Charles and Virginia Hickman Hospital,, Adrian, Michigan
  • ProMedica Monroe Regional Hospital, Monroe, Michigan
  • University of Minnesota, Minneapolis, Minnesota
  • Women's Cancer Center of Nevada, Las Vegas, Nevada
  • Women's Cancer Center of Nevada, Las Vegas, Nevada
  • Atlantic Health System, Morristown, New Jersey
  • Overlook Medical Center, Summit, New Jersey
  • University of New Mexico Comprehensive Cancer Center, Albuquerque, New Mexico
  • East Carolina University Health Medical Center, Greenville, North Carolina
  • OhioHealth Arthur G.H. Bing, MD Cancer Center, Columbus, Ohio
  • OhioHealth Research Institute, Columbus, Ohio
  • OhioHealth Riverside Methodist Hospital, Columbus, Ohio
  • OhioHealth Grant Medical Center, Columbus, Ohio
  • ProMedica Defiance Regional Hospital, Defiance, Ohio
  • ProMedica Fostoria Community Hospital, Fostoria, Ohio
  • ProMedica Memorial Hospital, Fremont, Ohio
  • OhioHealth Marion General Hospital, Marion, Ohio
  • Bay Park Hospital, Oregon, Ohio
  • ProMedica Laboratories Perrysburg, Perrysburg, Ohio
  • ProMedica Flower Hospital, Sylvania, Ohio
  • ProMedica Toledo Hospital, Toledo, Ohio
  • University of Oklahoma Health Stephenson Cancer Center, Oklahoma City, Oklahoma
  • Asplundh Cancer Pavilion, Willow Grove, Pennsylvania
  • Woman and Infants Hospital of Rhode Island, Providence, Rhode Island

Site status as of Oct 30, 2026. Check the live record before contacting a site.

Sources

Where this comes from

Registry record reviewed as fetched Oct 30, 2026, last updated by the sponsor Jul 29, 2026. Public record; not medical advice.

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