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As it is possible that BCMA detected in human MM serum and supernatants from cultured MM BMMCs may be http://www.selleckchem.com/products/pexidartinib-plx3397.html derived from non-malignant cells, we evaluated human BCMA levels in our human MM xenografts. MM tumours (LAG��-2, LAG��-1 and LAG��-1A) were analysed for human BCMA expression using IHC. The protein was detected in the three xenografts with the anti-BCMA Ab, which does not bind to mouse BCMA (Fig?4). No staining of other murine tissue was observed (data not shown). To exclude the possibility that the serum BCMA detected was not the result of dead cells, either from natural tumour cell turnover or anti-MM treatment, mice were allowed to grow non-paraprotein producing LAG��-2 tumours to approximately 1000?mm3 http://www.selleckchem.com/products/bmn-673.html at which time the mice were treated with bortezomib and cyclophosphamide. Mice were bled 8�C12?h following this combination treatment (n?=?7) or untreated controls?(n?=?4). A decrease in both tumour volume (P?=?0��0006) and serum human BCMA levels (P? http://www.selleck.cn/products/nlg919.html in the serum of non-tumour bearing SCID mice (data not shown). B-cell maturation antigen is expressed on the surface of normal and malignant B-cells (Laabi et?al, 1992, 1994; Thompson et?al, 2000; Novak et?al, 2004). Another surface receptor present on normal and malignant B-cells, the interleukin (IL)-6 receptor, has been shown to be elevated in the serum of MM patients (Jones et?al, 2001) but only in approximately 15% of patients (Stephens et?al, 2012). We have now shown that BCMA is present in the serum of MM patients; and, moreover, its levels correlate with the patient's response to therapy and overall survival. We used a blocking anti-BCMA Ab to show the specificity of the ELISA to detect BCMA and a mAb to confirm the presence of BCMA in these samples. Supernatants from cultured BMMCs from MM patients with active disease contain much higher levels in their culture medium than among healthy subjects and those with MGUS or indolent MM.