STAT5B and B-cell chronic lymphocytic leukemia: Interestingly, patients with CLL displayed a significant increase of p-STAT5 in granulocytes compared to controls (mean±SD: 72.1±24.1% versus 23.9±13.1%, P = 0.011), while its expression in monocytes and lymphocytes was similar to controls (mean±SD: 58.2±30.1% versus 75.1±12.9%, P = 0.480, and 1.9±2.3% versus 2.9±2.9%, P = 0.320, respectively) (Figure 4B).