What is your strategy for assessment of mutations from a liquid biopsy in metastatic breast cancer that has progressed on multiple therapies?   

Many times we encounter patients who do not have a tissue sample readily available or in whom obtaining such a sample would be hard. On a more molecular level, does the yield vary by use of PBMC vs ctDNA? In the absence of tumor tissue, how can we differentiate between somatic and germ-line mutations?



Answer from: Medical Oncologist at Academic Institution