HLA-G and plasmacytoma: Furthermore, the incidence of plasmacytomas (17.2 vs. 37.5%; P = 0.011), and the β2 microglobulin level were lower at diagnosis in the t(11;14) than in the HRCA group (4.49 mg/L ± 3.08 vs. 6.44 mg/L ± 5.03; P = 0.002).