Breast Cancer Clinical Trial
Official title:
Use of the PRO Onc Assay to Assess HER2 Overexpression and Activation in Patients With Metastatic Breast Cancer Whose Tumors Are HER2-Negative by Standard FISH Testing
This trial will evaluate the clinical significance of the PRO Onc assay and will assess the efficacy of HER2-targeted therapy in patients with HER2-negative breast cancer who have been identified as having HER2 overexpression/activation by the PRO Onc Assay.
This two-part trial is designed to evaluate the clinical significance of the PRO Onc assay when used in patients with metastatic HER2-negative breast cancer. The first part of this study will determine the incidence of HER overexpression/activation, as determined by the PRO Onc assay, in patients previously judged to have HER2-negative breast cancer by FISH analysis. Blood specimens will be obtained from patients with HER2-negative breast cancer; CTCs will then be isolated and tested for HER2 overexpression/activation using the PRO Onc Assay. When clinically indicated, fine needle aspiration biopsy will also be obtained and submitted for the PRO Onc Assay. If the incidence of HER2 overexpression/activation, as determined by the PRO Onc Assay, is >10%, the study will proceed to Part 2. Part 2 of this study will assess the efficacy of HER2-targeted therapy in a group of patients with HER2-negative breast cancer who are identified as having HER2 overexpression/activation by the PRO Onc Assay. Patients will be treated with either trastuzumab or pertuzumab. Patients who progress during the first 8 weeks will have HER2-targeted treatment discontinued and will be removed from study. After 8 weeks, patients who have stable disease will be allowed to add chemotherapy to HER2-targeted therapy. Patients who have an objective response to single-agent, HER2-targeted therapy after 8 weeks will continue single-agent therapy. ;
Endpoint Classification: Efficacy Study, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment
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