PNP and neuroblastoma: The IC50 values against GR, Waldenstrom macroglobulinemia (WM), purine nucleoside phosphorylase (PNP), LAN-5, and Gaslini Institute-LI-neuroblastoma (GILIN) cell lines were found to be 23, 27, 29, 16, and 19 μM, respectively [71].