Lymphoid tissue depletion with white blood cell changes consistent with bone marrow suppression in mice, rats and dogs
“Lymphoid tissue depletion and concomitant changes in white blood cell parameters, consistent with bone marrow suppression, were observed in mice, rats, and dogs”
Mouse: lung exposure 19-fold and brain exposure 2-fold that of plasma
“Pacritinib exposure levels within these three tissues were highest in the lungs (increased 19-fold versus plasma, area under the concentration-time curve [AUC]) followed by the brain (increased 2-fold versus plasma, AUC) and plasma.”
Toxicities at exposures significantly below clinical exposure (no safety margins)
“The toxicities observed in nonclinical studies occurred at exposures that were significantly lower than those anticipated at the proposed therapeutic dose (Table 27).”