Letrozole With and Without Simvastatin for the Treatment of Stage I-III Hormone Receptor Positive, HER2 Negative Breast Cancer

Early Phase 1

Recruiting

• Conditions: Anatomic Stage I Breast Cancer AJCC v8; Anatomic Stage II Breast Cancer AJCC v8; Anatomic Stage III Breast Cancer AJCC v8; HER2-Negative Breast Carcinoma; Hormone Receptor-Positive Breast Carcinoma; Invasive Breast Carcinoma
• Interventions: Drug: Letrozole; Drug: Simvastatin

• Registration Number: NCT05464810
• Lead Sponsor: Emory University

Brief Summary

This early phase I trial tests whether letrozole with simvastatin works better than letrozole alone to stop tumor cell proliferation in patients with stage I-III hormone receptor positive, HER2 negative invasive breast cancer. Letrozole and simvastatin may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. The addition of simvastatin to letrozole may be more effective at stopping the growth of cancer cells than letrozole alone.

Detailed Description

PRIMARY OBJECTIVE:

I. To determine if the addition of simvastatin to letrozole compared to letrozole alone will result in a decrease of Ki67, a biomarker of tumor proliferation, in postmenopausal women with stage I-III, hormone receptor positive, HER2 negative breast cancer following 14 days of pre-surgical therapy.

SECONDARY OBJECTIVES:

I. To determine if the addition of simvastatin to letrozole compared to letrozole alone will result in increased immune activation from pre- to post-treatment, based on the evaluation of the immune subtype composition in the tissue via multiplex immunofluorescence.

II. To determine if changes (from pre- to post-treatment) in immune activation correlate with changes in antiproliferative response, based on Ki-67 (from pre- to post-treatment).

III. To identify an association between response defined per percent change in Ki-67 and the percentage of tissue immune biomarkers CD8 and FOXp3.

IV. To determine if the addition of simvastatin to letrozole compared to letrozole alone will result in increased pain based on Patient-Reported Outcomes Measurement Information System (PROMIS) from pre- to post-treatment.

V. To describe the safety and tolerability of letrozole +/- simvastatin in the pre-surgical setting.

EXPLORATORY OBJECTIVES:

I. In both arms of the trial, assess the levels of blood-based biomarkers (CRP, IL-6, IL-10, TGF-beta, and TNF-alpha) in pre- and post-treatment blood samples.

Ia. Determine if changes (from pre- to post-treatment) in the levels of these blood-based biomarkers correlate with changes in antiproliferative response, based on Ki67 (from pre- to post-treatment).

Ib. Determine if changes (from pre- to post-treatment) in the levels of these blood-based biomarkers correlate with changes in immune activation, based on the evaluation of the immune subtype composition in the tissue via multiplex immunofluorescence (from pre- to post-treatment).

II. In both arms of the trial, assess fasting total cholesterol levels in pre- and post-treatment blood samples to determine if there is a correlation with changes in antiproliferative response, based on Ki67 (from pre- to post-treatment).

III. In both arms of the trial, assess HMG-CoA Reductase immunohistochemistry (IHC) expression in pre- and post-treatment tumor tissue to determine if there is a correlation with changes in antiproliferative response, based on Ki67 (from pre- to post-treatment).

OUTLINE: Patients are randomized to 1 of 2 arms.

ARM I: Patients receive letrozole orally (PO) once daily (QD) and simvastatin PO QD for 14 days in the absence of disease progression or unacceptable toxicity.

ARM II: Patients receive letrozole PO QD for 14 days in the absence of disease progression or unacceptable toxicity.

After completion of study treatment, patients are followed for 30 days.

Study Timeline

• Study First Submitted: 2022-06-24
• Study First Submitted QC: 2022-07-14
• Study First Posted: 2022-07-19
• Study Start: 2022-09-02
• Status Verified: 2025-05
• Last Update Submitted: 2025-05-20
• Last Update Posted: 2025-05-23
• Primary Completion: 2026-04-15
• Study Completion: 2027-04-15

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Female
• Target Recruitment: 40

Inclusion Criteria

• Age >= 18 years

• Biopsy proven hormone receptor positive, HER2 negative stage I-III invasive breast cancer

  • Estrogen receptor (ER) and/or progesterone receptor (PR) positivity are defined as >= 10% of cells expressing hormonal receptors via IHC analysis

  • HER2 negativity is defined as either of the following by local laboratory assessment

    • IHC 0, 1+, or 2+ and in situ hybridization (ISH) non-amplified (ratio of HER2 to CEP17 < 2.0 or single probe average HER2 gene copy number < 4 signals/cell)

• Minimum primary tumor size 5 mm on any breast imaging (mammogram, ultrasound, magnetic resonance imaging [MRI])

• Baseline Ki-67 IHC expression on tumor tissue >= 10%

• Post-menopausal women

  • Prior bilateral oophorectomy
  • Age >= 55 years
  • Age < 55 and amenorrheic for 12 months or more in the absence of chemotherapy, endocrine therapy, or ovarian suppression and follicle stimulating hormone (FSH), luteinizing hormone (LH), and estradiol in the postmenopausal range

• Eastern Cooperative Oncology Group (ECOG) performance status 0-2

• Prior treatment:

  • No systemic therapy (chemotherapy, immunotherapy, endocrine therapy, and/or investigational therapy) within 3 months of trial enrollment

• No statins, fibrates, or ezetimibe within 3 months of trial enrollment

• No active liver disease

• Hemoglobin >= 9.0 g/dl (Note: the use of transfusion or other intervention to achieve hemoglobin [Hgb] >= 9.0 g/dl is acceptable) (within 14 days prior to initiation of study treatment)

• Absolute neutrophil count (ANC) >= 1,500/mcL (after at least 7 days without growth factor support or transfusion) (within 14 days prior to initiation of study treatment)

• Platelets >= 100,000/mcL (within 14 days prior to initiation of study treatment)

• Total bilirubin =< 2 institutional upper limit of normal (ULN) (within 14 days prior to initiation of study treatment)

• Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) =< 3 institutional ULN (within 14 days prior to initiation of study treatment)

• Serum creatinine =< 2 mg/dL (or glomerular filtration rate >= 40 mL/min) (within 14 days prior to initiation of study treatment)

• Willingness and ability of the subject to comply with scheduled visits, drug administration plan, protocol-specified laboratory tests, other study procedures, and study restrictions

• Be willing and able to provide written informed consent for the trial

Exclusion Criteria

• Patients who are receiving any other investigational agents or an investigational device within 3 months before administration of first dose of study drugs
• History of allergic reactions attributed to compounds of similar chemical or biologic composition to simvastatin and/or letrozole
• Concomitant use of strong CYP3A4 inhibitors (i.e. clarithromycin, erythromycin, itraconazole, ketroconazole, nefazodone, Posaconazole, voriconazole, protease inhibitors [including boceprevir and telaprevir], telithromycin, cobicistat-containing products), cyclosporine, danazol, and gemfibrozil
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, substance abuse disorders, or psychiatric illness/social situations that would limit compliance with study requirements
• Significant cardiovascular disease (e.g., myocardial infarction, arterial thromboembolism, cerebrovascular thromboembolism) within 3 months prior to start of study therapy; angina requiring therapy; symptomatic peripheral vascular disease; New York Heart Association class 3 or 4 congestive heart failure; or uncontrolled grade >= 3 hypertension (diastolic blood pressure >= 100 mmHg or systolic blood pressure >= 160 mmHg) despite antihypertensive therapy
• Has a known additional malignancy that is progressing or requires active treatment. Exceptions include basal cell carcinoma of the skin or squamous cell carcinoma of the skin that has undergone potentially curative therapy

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Arm I (letrozole, simvastatin)	Simvastatin	Patients receive letrozole PO QD and simvastatin PO QD for 14 days in the absence of disease progression or unacceptable toxicity.
Arm I (letrozole, simvastatin)	Letrozole	Patients receive letrozole PO QD and simvastatin PO QD for 14 days in the absence of disease progression or unacceptable toxicity.
Arm II (letrozole)	Letrozole	Patients receive letrozole PO QD for 14 days in the absence of disease progression or unacceptable toxicity.

Primary Outcome Measures

Name	Time	Method
Mean percentage change in Ki-67	From pre-surgical baseline to 14 days following preoperative therapy	Negative change denotes reduction. Ki-67 is a validated surrogate marker for disease-free survival in patients with hormone receptor positive (HR+), HER2- breast cancer. Ki-67 values at 14 days are expressed as geometric mean proportions of the baseline and transformed into percentage change. Geometric mean percentage change of Ki-67 from pre- to post-treatment is calculated and compared between the two treatment arms. A two-sided Mann-Whitney U or Wilcoxon Rank-Sum test is used.

Secondary Outcome Measures

Name	Time	Method
Response per Ki-67	Through study completion, an average of 1 year	Responders are defined as those with \>= 40% pre- to post-treatment decrease in Ki-67, and non-responders are those with \< 40% decrease in Ki-67. Descriptive statistics (mean, standard deviation, median, min, max) are applied to biomarkers of interest at 2 designated time points, prior to preoperative therapy (utilizing archival tissue from baseline biopsy) and following completion of 14 days of preoperative therapy. Absolute change or percentage change of biomarkers is calculated and compared between the two treatment arms using the nonparametric Mann-Whitney U test. Correlation among biomarkers is described by Pearson correlation coefficient with 95% confidence interval. The p-value is adjusted by Benjamini-Hochberg procedure to control the false discovery rate.
Change in the level of the following immune biomarkers: Percentage of CD8+ T cells, percentage of FOXp3 Treg cells, ratio of CD8+/Treg ratio	Through study completion, an average of 1 year	Based on multiplex immunofluorescence. Descriptive statistics (mean, standard deviation, median, min, max) are applied to biomarkers of interest at 2 designated time points, prior to preoperative therapy (utilizing archival tissue from baseline biopsy) and following completion of 14 days of preoperative therapy. Absolute change or percentage change of biomarkers is calculated and compared between the two treatment arms using the nonparametric Mann-Whitney U test. Correlation among biomarkers is described by Pearson correlation coefficient with 95% confidence interval. The p-value is adjusted by Benjamini-Hochberg procedure to control the false discovery rate.
Incidence of adverse events	Up to 30 days after surgery	Evaluated per Common Terminology Criteria for Adverse Events (CTCAE) version (v) 5 criteria. Adverse events are summarized descriptively using frequencies and percentages of all captured toxicities and grades using CTCAE v.5 criteria.
Patient-Reported Outcomes Measurement Information System (PROMIS) for pain	Up to 30 days after surgery

Trial Locations

Locations (4)

Grady Healthcare System; 🇺🇸 Atlanta, Georgia, United States

Emory University Hospital Midtown; 🇺🇸 Atlanta, Georgia, United States

Emory University Hospital/Winship Cancer Institute; 🇺🇸 Atlanta, Georgia, United States

Emory Saint Joseph's Hospital; 🇺🇸 Atlanta, Georgia, United States