Influence of t(4;14), del(17p), and β2-microglobulin level on overall survival. The black curve is for the 155 patients lacking del(13), t(4;14), and del(17p), and presenting a low β2-microglobulin level (≤ 4 mg/L). The green curve represents the same patients, but with a high β2-microglobulin level (> 4 mg/L; 74 patients). The blue curve depicts the 110 patients lacking t(4;14) and del(17p) with a low β2-microglobulin level, but presenting a del(13). The red curve represents the 69 patients lacking both t(4;14) and del(17p) with a high β2-microglobulin level and with a del(13). The gray curve shows the 63 patients with either a t(4;14) or a del(17p) in more than 60% of their plasma cells, and a low β2-microglobulin level. Finally, the pink curve shows the overall survival of the 42 patients with either a t(4;14) or a del(17p) in more than 60% of their plasma cells, and a high β2-microglobulin level.