SDC1 and plasma cell myeloma: In 2011, the CellSearch System was patented as a method to capture and detect rare circulating plasma cells (CPC) and abnormal plasma cells or multiple myeloma cells (CMMC) using an anti-CD138 FerroFluid conjugated antibody in order to detect, monitor and characterize CMMC diseases, including monoclonal gammopathy of undetermined significance (MGUS) and Smoldering multiple myeloma (SMM) (12, 13).