MXRA5 and plasma cell myeloma: Using a proteomics approach, Glavey et al. 71 confirmed that MXRA5 is part of the bone marrow extracellular matrix glycoproteins in normal and relapsed multiple myeloma patients, but until now changes in the endothelium by MXRA5 expression and concomitant effects in extracellular matrix microenvironment are unknown.