PVR and plasma cell myeloma: We analyzed the morphology of the patient primary myeloma cells for expression levels of MHC I, MICA, MICB, ULBP1, ULBP2/5/6, HLA-E, CD38 (n = 12), CD112, CD155, ICAM-1 and PD-L1 (n =5) using flow cytometry (Figure 7A).