MUC1 and neoplasm: Activation markers, plasma cell markers, and associated markers that do not define the lineage are positive, such as human leukocyte antigen (HLA)-DR, CD30, CD38, and VS38c, a monoclonal antibody that recognizes a rough endoplasmic reticulum (rER) intracellular antigen termed “cytoskeleton-linking membrane protein 63.” rER is typically found in viable tumor cells and is abundant in plasma cells, CD138, and epithelial membrane antigen (EMA) [14, 15].