Compiled BFU-E and CFU-GM colony-forming assay data.

Results are plotted as a function of STI571 concentration versus the percentage of colony-formation inhibition. Each data line represents a dose of antileukemic agent, with data points representing averaged colony-formation responses across all 4 patients. Combinations of antileukemic agents and STI571 that produced a statistically significant decrease in colony formation are denoted as significant (*, .005 < P < .05) or highly significant (+,P < .005) in comparison to STI571 alone.