Fig. 3.
Inhibition of CML progenitors increases with longer exposure to imatinib mesylate.
CFC frequency for CML CD34+ cells, normalized to frequency for cells not exposed to imatinib mesylate, is plotted as a function of exposure time. Data graphed are for 1 μM (- - ♦ - -]), 2 μM (—● - -), and 5 μM (—▾—) imatinib mesylate and shown as the mean ± SEM for replicate experiments (24 hours, n = 7; and 48-96 hours, n = 5). Progenitor frequency is significantly suppressed as exposure time increased from 24 to 96 hours (3 asterisks, P < .001; 2 asterisks,P < .01).