Human K562 cells expressing WT and WHIM-mutant CXCR4 (CXCL12-binding IC50 6.1 nM WT; 3.2-11 nM mutants)
“The compound inhibited CXCL12 binding to CXCR4 with an IC50 of 6.1 nM in K562 lymphoblast cells stably overexpressing wild type (WT) CXCR4 and IC50 ranging between 3.2 and 11 nM in cells overexpressing different WHIM mutant variants.”
EMA: data did not demonstrate in vivo nonclinical efficacy in WHIM; no animal PK/PD data for dose finding
“Nevertheless, considering the compounds used in these studies, the data provided did not demonstrate non-clinical efficacy of mavorixafor in the WHIM syndrome in vivo. No PK/PD correlation data in animal models to support clinical dose finding were presented either.”