Peripheral blood mononucleocyte histone acetylation relationship to panobinostat dose and plasma concentration, response, toxicity, and white cell count. Histone acetylation neither correlates with panobinostat dose (A) nor plasma concentration (ng/ml, B). (C) Box plots of histone acetylation in patients who did (CB) versus those who did not (PD) benefit from treatment and in patients who experienced grade 1/2 versus grade 3/4 toxicity. (D) Dot plots of all leukocytes (WBC), neutrophils (ANC), and lymphocytes (Lympho) on day 5 of treatment normalized to pretreatment on day 1 of cycle 1 comparing patients who did (CB) and did not (PD) benefit from treatment. The bar indicates the mean. Correlations were conducted using Pearson's correlation coefficient method.