Development of a Cell Free DNA Assay as a Biomarker for Predicting Early Non-response to Therapy in Metastatic Cancer

Accrue samples for the further development and clinical validation of a blood-based cell-free DNA (cfDNA) quantitative real-time polymerase chain reaction (qPCR) assay as a potential biomarker for early non-response to therapy in stage IV non-small cell lung cancer (NSCLC), colorectal cancer (CRC) and breast cancer (BC).