To determine whether CD84 plays a role in the MM disease and to further understand the interaction of these malignant cells with their microenvironment, we first evaluated CD84 expression on MM (gating is shown in Supplemental Figure 1A; supplemental material available online with this article; https://doi.org/10.1172/jci.insight.141683DS1). The gene discussed is CD84; the disease is Miyoshi myopathy.