Overexpression of MDR-related p170 glycoprotein in chronic myeloid leukemia.

Abstract

Positive cells were found in 11/17 cases in chronic phase (65%), in 4/8 cases in accelerated phase, and in 23/26 cases in blastic phase (89%). The proportion of positive cells, which ranged between less than 1% and 95%, was higher in blastic phase (mean 32 +/- 29.9) than in chronic phase (mean 3 +/- 5.3) (p = 0.006). These findings show that p170 overexpression is common in Ph+ CML, especially after progression to blastic phase, and suggest that p170-related MDR may contribute significantly to treatment failure.