LCN2 and B-cell chronic lymphocytic leukemia: In addition, the release of NGAL by primary CLL cells in vitro and under basal conditions, was studied in 33 CLL cases: six samples were strongly positive (>10 ng/mL for 106 cells), 16 displayed an intermediate signal (0.3–3.7 ng/mL for 106 cells) and the last 11 were negative (<0.1 ng/mL for 106 cells) (Figure S1).