PRV-1 mRNA expression in granulocytes.

PV indicates polycythemia vera; CFP, congenital or familial polycythemia; ET, essential thrombocythemia. The boxes represent the interquartile range that contains 50% of values. The bars are lines that extend from the box to the highest and lowest values. A line across the box indicates the median. PRV-1/GAPDH expression ratio (calculated as 2^{ΔCT(GAPDH-PRV1)}) was significantly increased in patients with PV (***P < .0001) when compared with Mann-Whitney nonparametric test to 33 healthy controls or CFP patients.