RPMI-8226/RFP cells are derived from the human human myeloma RPMI-8226 cell line by stably integration of a constitutive RFP stably expression construct. The RPMI-8226 cell line is a valuable tool for understanding multiple myeloma and developing new treatments, including CAR-T (chimeric antigen receptor T-cell) therapy. RPMI-8226/RFP cells stably express RFP, can be used for in vitro assays and in vivo imaging.