The proportion of cells with Amp1q21 at diagnosis and relapse. The proportion of cells with Amp1q21 is indicated by the height of the bar on the y-axis. The proportion of cells with 3 and with 4 or more copies of 1q21 in each sample is indicated by blue and red, respectively. A total of 479 newly diagnosed MM and 45 relapsed MM samples are ordered from the lowest to highest proportion of cells with Amp1q21 from left to right in each group on the x-axis. The mean/median percentages of cells with Amp1q21 at diagnosis and relapse were 36%/65% and 7%/88%, respectively.