Diagram showing logarithmic changes of Bcr-Abl levels in PB and BM samples.

Log changes after 2 weeks (2W), 4 weeks (4W), and at the time of best response (best) during imatinib therapy are depicted for good responders (●) and poor responders (▴) separately. The medians are represented by lines. The changes of Bcr-Abl turning into a negative PCR result were calculated by using the particular sensitivity of the PCR reaction instead. These values are depicted by ○.