ATR and plasma cell myeloma: Although at lower levels compared with multiple myeloma, BCMA was expressed on a number of B-cell malignancies cell lines, including WM cell lines (MWCL1; gMFI 2762 and BCWM.1; gMFI 2069) and CLL cell lines (CII; gMFI 2059, PGA; gMFI 2097, Mec-1; gMFI 1376).