By: Bo Zhao, MD, PhD
Monoclonal gammopathy is a medical condition caused by abnormal proteins in the blood. These proteins grow from a small number of plasma cells, a type of white blood cell, found in the bone marrow. The most common condition linked with these abnormal proteins is monoclonal gammopathy of undetermined significance (MGUS). It is not cancer but does put these patients in a higher risk category for developing cancer in the blood or bone marrow.