Letrozole as a Treatment of Endometrial Cancer

This study has been completed.
Information provided by (Responsible Party):
Lloyd H. Smith, MD, PhD, University of California, Davis
ClinicalTrials.gov Identifier:
First received: October 15, 2009
Last updated: April 3, 2015
Last verified: April 2015

Some cases of endometrial cancer are dependent on estrogen for their growth. Letrozole blocks estrogen production in the body. The purpose of this study is to determine if the investigators can predict which patients might benefit from Letrozole treatment by studying the many different forms of the estrogen receptor molecule that exist within the cancer tissues. To participate in this study, the patients must be 40 years of age or older and have biopsy-proven endometrial carcinoma, either well differentiated or moderately differentiated forms. Also, to be eligible to participate in this study, the patients need to be healthy enough to have a hysterectomy. If the patients are less than age 60, they will need a blood test (FSH) to confirm that they have gone into menopause.

Condition Intervention
Endometrial Carcinoma
Drug: Letrozole

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Predicting Aromatase Inhibitor Responsiveness in Endometrial Carcinoma

Resource links provided by NLM:

Further study details as provided by University of California, Davis:

Primary Outcome Measures:
  • Changes in Ki67 Expression After About 3 Weeks of Letrozole Treatment for Patients With Endometrial Cancer [ Time Frame: At time of consent and after hysterectomy (generally about 3 weeks) ] [ Designated as safety issue: No ]
    Changes in %Ki67 staining cells by immunoperoxidase of paraffin embedded, formalin fixed tissue

Enrollment: 43
Study Start Date: October 2009
Study Completion Date: September 2013
Primary Completion Date: September 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Letrozole
letrozole 2.5 mg PO daily for 2-3 weeks prior to hysterectomy.
Drug: Letrozole
2.5 mg daily from the day of enrollment to the day before surgery, generally about 3 weeks
Other Names:
  • Femara
  • 4-[(4-cyanophenyl)-(1,2,4-triazol-1-yl)methyl]benzonitrile,
  • CAS number 112809-51-5
No Intervention: control
no treatemtn prior to hysterectomy


Ages Eligible for Study:   40 Years and older
Genders Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • FIGO grade 1 or 2 endometrioid adenocarcinoma of the endometrium
  • Post menopausal status must be demonstrated
  • Signed informed consent

Exclusion Criteria:

  • FIGO grade 3 endometrioid adenocarcinoma or non-endometrioid cancers of the endometrium
  • Younger than 40 or postmenopausal status not established
  • Pregnant or breastfeeding
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00997373

United States, California
University of California Davis
Sacramento, California, United States, 95817
University of California, Davis
Sacramento, California, United States, 95817
Sponsors and Collaborators
University of California, Davis
Principal Investigator: Lloyd H. Smith, MD, PhD University of California, Davis
  More Information

No publications provided

Responsible Party: Lloyd H. Smith, MD, PhD, Professor, University of California, Davis
ClinicalTrials.gov Identifier: NCT00997373     History of Changes
Other Study ID Numbers: 200917341, CFEM 345AUS63
Study First Received: October 15, 2009
Results First Received: January 26, 2015
Last Updated: April 3, 2015
Health Authority: United States: Institutional Review Board

Keywords provided by University of California, Davis:
Endometrial Cancer
Endometrial Carcinoma
Aromatase Inhibitor

Additional relevant MeSH terms:
Endometrial Neoplasms
Genital Diseases, Female
Genital Neoplasms, Female
Neoplasms by Histologic Type
Neoplasms by Site
Neoplasms, Glandular and Epithelial
Urogenital Neoplasms
Uterine Diseases
Uterine Neoplasms
Aromatase Inhibitors
Antineoplastic Agents
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Therapeutic Uses

ClinicalTrials.gov processed this record on October 09, 2015