MM plasma cells retain adriamycin: MM B and T cells efficiently export adriamycin. Staining was as for Fig 1, but cells were loaded with adriamycin and phenotype was identified using FITC conjugates. T cells from BM or blood and B cells from blood were compared to the BM plasma cells. For each of 3 different MM patients, paired blood and BMC were analyzed in tandem. **P < .001, ***P < .0001 as compared to BM plasma cells.