Breast Cancer Clinical Trial
Official title:
Pilot Study to Analyze a Novel Mechanism Underlying Response to Tamoxifen Therapy in Breast Cancer Patients
This study will help to understand the interaction between estrogen receptor-alpha (ER alpha) and tumor suppressor protein p53 as well as impact on patient tumor gene expression in response to the hormonal therapy Tamoxifen. This information may eventually help select the appropriate therapy for future patients with similar cancer.
Women with abnormal mammogram or suspicious masses will undergo diagnostic core biopsies
which will be analyzed for ER/PR and HER2Neu expression. For patients that are ER positive,
p53 staining will be done.
Women presenting tumors with an Allred score of 3 or greater status will be approached to
participate.
Women will be randomized to either standard of care surgical therapy or a 4 week intervention
of Tamoxifen 20mg daily for 4 weeks prior to surgery. During the intervention, blood draws
will be done to measure levels of tamoxifen metabolites in the blood and test for
polymorphisms that may decrease levels of active metabolites.
Women will undergo two blood draws for PK/PD and one for pharmacogenomics. Tissue microarray
(TMA) will be generated from resected tumors for immunohistochemistry (IHC) and proximity
ligation assay (PLA) for measuring ER alpha-p53 interaction.
Tumor tissue will be used for analyzing tamoxifen metabolites and estradiol levels. RNA and
proteins from the tumors will be used for analyzing gene expression.
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