Breast Cancer Lymphedema: Role of Insulin Resistance/FOXC2

To better understand the mechanisms leading to lymphedema development in breast cancer survivors, and the implications for potential innovative approaches to the screening, prevention and treatment of this condition.

Study Overview

• Status: Completed
• Conditions: Breast Cancer; Lymphedema

Detailed Description

Lymphedema of the arm is an important, under-recognized, and under-treated complication of successful surgical and radiotherapeutic treatment of breast cancer. As a result of advances in early detection and effective adjuvant therapies, many women diagnosed with breast cancer today can expect survival that is similar to age-matched women without breast cancer. Nevertheless, this source of substantial physical and psychological morbidity has not attracted sufficient attention from industry or the scientific research community to result in either effective risk stratification or the availability highly effective therapeutic interventions.

While the presence and degree of arm edema can, in part, correlated with the extent of axillary surgery, we still comprehend only poorly the factors that predispose to overt lymphatic insufficiency in the patients at risk for lymphedema by virtue of prior breast cancer treatment. It is likely that this anatomic and regenerative variability relies, at least in part, upon an as yet undefined genetic substrate. A growing body of evidence suggests that mutations in the nuclear transcription gene FOXC2 are responsible for a broad clinical array of primary lymphedema syndromes. The biology of breast cancer-associated lymphedema, including its characteristic latency phase, suggests that similar mechanisms may operate in the predisposition to this and other forms of secondary lymphedema.

In parallel, breast cancer-associated lymphedema has several clinical attributes that suggest a relationship to, and a role for, insulin resistance. In this regard, it is interesting to contemplate the recent, multiple lines of evidence that suggest that the gene FOXC2 regulates, directly or indirectly, several aspects of adipocyte metabolism and that genetic variability in the gene may influence features associated with the insulin resistance and the metabolic syndrome. These observations are of particular interest because of the recognized relationship of FOXC2 haploinsufficiency to a variety of identified lymphedema syndromes. It is therefore attractive to conjecture that insulin resistance, perhaps mediated through polymorphisms of FOXC2,.confers secondary lymphedema risk and predisposes to the as yet poorly understood tendency for breast cancer survivors to acquire substantial, pathological deposits of adipose tissue in the affected extremities with chronicity of the lymphedema.

The specific aims of this proposal are as follows: (1) to quantitatively assess insulin sensitivity in late breast cancer survivors, equally divided among subjects who display clinical evidence of ipsilateral arm edema and those that do not; (2) to correlate the presence of relative insulin resistance to the expression of breast cancer-associated lymphedema. It is hypothesized that such an approach has the capability to lead to future elaboration of appropriate risk stratification and targeted therapeutic interventions; (3) as a pilot investigation, to sequence the FOXC2 gene, including the untranslated 5' region, in each these patients, to identify potential polymorphisms that might correlate both to the presence of insulin resistance and lymphedema risk.

• Study Type: Observational
• Enrollment (Actual): 30

Contacts and Locations

Study Locations

• United States
  • California
    • Stanford, California, United States, 94305
      • Stanford University School of Medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Female

• Sampling Method: Non-Probability Sample

Study Population

Breast cancer survivors

Description

Inclusion Criteria:

• Patients enrolled in the proposed studies must be survivors of breast cancer at a time point at least 4 years following the initial surgery and radiotherapy for the disease.
• Patients must have a history of unilateral axillary lymph node dissection.
• Patients referred to, or that receive their care within the Stanford University Breast Cancer Program and the Stanford Center for Lymphatic and Venous Disorders.
• Patients will be required to have the capacity to provide informed consent.

Exclusion Criteria:

• Patients with other serious systemic illness (renal failure, hepatic dysfunction, congestive heart failure, neurological or psychological impairment) that would confound the study or impair the patients' ability to participate.
• Patients will not be enrolled if they are taking drugs that affect carbohydrate metabolism.
• Patients with recurrent breast cancer or other forms of pre-existing lymphedema will be ineligible.

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Prospective

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
assess insulin sensitivity in late breast cancer survivors	visit 2

Collaborators and Investigators

• Sponsor: Stanford University
• Collaborators: California Breast Cancer Research Program

Study record dates

Study Major Dates

• Study Start: July 1, 2005
• Primary Completion (Actual): March 1, 2012
• Study Completion (Actual): April 1, 2012

Study Registration Dates

• First Submitted: September 29, 2006
• First Submitted That Met QC Criteria: October 2, 2006
• First Posted (Estimate): October 3, 2006

Study Record Updates

• Last Update Posted (Estimate): May 30, 2013
• Last Update Submitted That Met QC Criteria: May 28, 2013
• Last Verified: May 1, 2013

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Pathologic Processes; Glucose Metabolism Disorders; Metabolic Diseases; Skin Diseases; Neoplasms; Lymphatic Diseases; Neoplasms by Site; Postoperative Complications; Breast Diseases; Hyperinsulinism; Breast Neoplasms; Lymphedema; Insulin Resistance; Breast Cancer Lymphedema
• Other Study ID Numbers: BRSNSTU0009 (Other Identifier: Stanford University); 96204 (Other Identifier: Stanford University Alternate IRB Approval Number); 2580 (Stanford IRB)