Metastatic Breast Cancer Clinical Trial
Official title:
Using a Liquid Biopsy to Monitor Metastatic Breast Cancer Treatment
The goal of this observational study is to assess the effectiveness of the mDETECT breast cancer blood test at monitoring treatment response in women with metastatic breast cancer undergoing treatment.
Breast cancer is the most common cancer in Canadian women. While survival rates for women with metastatic breast cancer have almost doubled in the last 20 years, the 5-year survival rate is about 25%. Currently, determining whether a breast cancer therapy is working is very difficult. Women undergo CT-scans every three months to assess the effectiveness of their therapy. If the chosen treatment is not effective, a patient would have been delayed in receiving a more effective treatment and will be exposed to the serious side effects of their ineffective treatment during this time. The investigators have developed a blood test, called mDETECT, which is a DNA methylation-based liquid biopsy that targets multiple tumour specific hypermethylated regions on DNA. DNA shed from tumours travels through the blood stream and which can be collected through a blood draw and analyzed for breast cancer specific methylation patterns. The mDETECT breast cancer assay is sensitive and specific and has been proven to work well in detecting breast cancer in women with metastatic disease. This assay has been designed to work with all subtypes of breast cancer. Moreover, this blood test measures changes in the size of the tumour; therefore, it will work with any treatment. The goal of this observational study is to assess the effectiveness of the mDETECT breast cancer blood test in women undergoing treatment for metastatic breast cancer to determine if a response to therapy can be seen earlier than the current 3 month time point for CT-scans. In this study, women newly diagnosed with metastatic breast cancer or women beginning a new line of treatment for metastatic breast cancer will be recruited. Participants will have blood drawn at baseline and multiple timepoints throughout treatment. The participants will also be monitored using the current standard of care, imaging every 3 months with CT-scans. The aim of this study will be to determine if the mDETECT blood test can predict within the first few weeks of treatment the results of the 3 month CT-scan. ;
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