WT1 and plasmacytoma: In the plasmacytoma samples (n = 28), soft-tissue plasmacytoma (n = 14) and relapsed plasmacytoma (n = 9) had an exceptional high rate of WT1 protein expression (100%) as compared to bone plasmacytoma (78.6%, n = 11/14) (p = 0.067) (Figure 1B).