Systemic Dickkopf-related Protein 1 (DKK1)During Estrogen Level Changes in Post-menopausal Breast Cancer Patients Treated With Aromatase Inhibitors

University of Arkansas17 enrolled

Overview

The investigators are hypothesizing that decreasing estrogen levels will cause serum DKK1 to peak, then decrease gradually as estrogens reach a new lower, but steady level. The investigators also believe that the peak in DKK1 will initiated a wave of stem cell diversion from the osteoblastogenic pathway to the adipogenic pathway. The investigators will conduct a longitudinal cohort study of post menopausal women with hormone-responsive breast cancer that will be treated AIs. The study will observe anthromorphic and serum marker changes during the first year of their treatment.

Study Type

OBSERVATIONAL

Enrollment

Conditions

Breast Cancer

Eligibility

Sex: FEMALEMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Post Menopausal Breast cancer patients with planned treatment of aromatase inhibitors. * 18 years or older Exclusion Criteria: * BMI \>30 or \<18 * Osteoporosis as defined by protocol. * Subjects currently on bisphosphonate therapy. * History of primary or secondary hyperparathyroidism * History of Hypo-or Hyperthyroidism * History of Vitamin D levels below LLN * History of creatinine clearance below the EGFR * History ofLiver function tests above 1.5 times ULN including LDH, SGOT, SGPT, Alkaline phosphatase, and Bilirubin * History of documented cirrhosis of the liver * History of chronic heparin use * History of chronic glucocorticoid therapy

Locations (1)

Outcomes

Primary Outcomes

Estrogen level suppresses DKK1

With the start of AI treatment, estrogen levels will decline to almost undetectable levels. We believe this decrease in estrogen will lift suppression of DKK1 and allow its expression to peak during the 1st month of treatment, and decline more slowly thereafter. During the first 26 weeks of treatment, we expect levels of CTx to rise, PTH to fall, and P1NP to show no change, findings that would be consistent with Heshmati's study.

Time frame: 26 weeks