Table S2.

Changes in variables from baseline to 4 weeks on treatment

	Imatinib (n = 8)		Placebo (n = 4)
Variable	Change	P	Change	P
RBC count, 106 cells/μL	−0.3	0.03	−0.15	0.7
Hemoglobin, g/dL	−0.4	0.08	−0.4	0.8
Hematocrit, %	−2.5	0.009	−2.5	0.5
MCH, pg	0.6	0.1	0.5	0.5
WBC count, 103 cells/μL	1	0.3	−0.3	0.4
Total tryptase, ng/mL	−4.2	0.002	0.9	0.4
%CD34+CD133+	−0.02	0.05	0.01	0.8
%c-Kit+	−1.6	0.05	0.3	0.9
%c-Kit+/CD34+CD133+	−1.5	0.7	−8.5	0.02
PDGFR-α, ng/mL	26	0.04	6	0.4

^NoteRBC: red blood cell; MCH: mean corpuscular hemoglobin; WBC: white blood cell; PDGFR: platelet-derived growth factor receptor.