The natural killer (NK) T cell compartment is deficient following autologous stem cell transplantation (ASCT). (a) Representative fluorescence activated cell sorter (FACS) plots demonstrate how NKT cell subsets are analysed. (b) CD4+, CD4−CD8−, CD4−CD8+, CD161+ and CD56+ NKT cell subsets were monitored during a longitudinal study of previously untreated multiple myeloma (MM) patients receiving lenalidomide, ASCT and dendritic cell (DC) vaccination in MM. (c) Cell numbers for CD4+, CD4−CD8−, CD4−CD8+, CD161+ and CD56+ NKT cell subsets are shown for individual patients.