B7-expression on human AML blasts according to FAB type.

The expression of B7-1 (A) and B7-2 (B) on human AML blasts was studied by flow cytometry as described in “Materials and methods.” The average percentages of B7-1⁺ or B7-2⁺ blasts are shown as horizontal lines for the different FAB types.P = .736 for B7-1, P < .0001 for B7-2, by Kruskal-Wallis analysis.