TY - JOUR
T1 - Dried blood spot sampling of nilotinib in patients with chronic myeloid leukaemia
T2 - a comparison with venous blood sampling
AU - Boons, Christel C.L.M.
AU - Chahbouni, Abdel
AU - Schimmel, Anneliene M.
AU - Wilhelm, Abraham J.
AU - den Hartog, Yvonne M.
AU - Janssen, Jeroen J.W.M.
AU - Hendrikse, N. Harry
AU - Hugtenburg, Jacqueline G.
AU - Swart, Eleonora L.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Objectives: To compare nilotinib concentrations obtained by venous blood sampling and dried blood spot (DBS) in patients with chronic myeloid leukaemia (CML). It was investigated how to predict nilotinib plasma levels on the basis of DBS. Methods: Forty duplicate DBS and venous blood samples were collected from 20 patients. Capillary blood was obtained by finger prick and spotted on DMPK-C Whatman sampling paper, simultaneously with venous blood sampling. Plasma concentrations were predicted from DBS concentrations using three methods: (1) individual and (2) mean haematocrit correction and (3) the bias between plasma and DBS concentrations. Results were compared using Deming regression and Bland–Altman analysis. Key findings: Nilotinib plasma concentrations ranged from 376 to 2663 μg/l. DBS concentrations ranged from 144 to 1518 μg/l. The slope was 0.56 (95% CI, 0.51 to 0.61) with an intercept of −41.68 μg/l (95% CI, −93.78 to 10.42). Mean differences between calculated and measured plasma concentrations were −14.3% (method 1), −14.0% (method 2) and −0.6% (method 3); differences were within 20% of the mean in 73%, 85% and 80% of the samples, respectively. The slopes were respectively 0.96 (95% CI, 0.86 to 1.06), 0.95 (95% CI, 0.86 to 1.03) and 1.00 (95% CI, 0.91 to 1.09). Conclusions: Plasma concentrations of nilotinib could be predicted on the basis of DBS. DBS sampling to assess nilotinib concentrations in CML patients seems a suitable alternative for venous sampling.
AB - Objectives: To compare nilotinib concentrations obtained by venous blood sampling and dried blood spot (DBS) in patients with chronic myeloid leukaemia (CML). It was investigated how to predict nilotinib plasma levels on the basis of DBS. Methods: Forty duplicate DBS and venous blood samples were collected from 20 patients. Capillary blood was obtained by finger prick and spotted on DMPK-C Whatman sampling paper, simultaneously with venous blood sampling. Plasma concentrations were predicted from DBS concentrations using three methods: (1) individual and (2) mean haematocrit correction and (3) the bias between plasma and DBS concentrations. Results were compared using Deming regression and Bland–Altman analysis. Key findings: Nilotinib plasma concentrations ranged from 376 to 2663 μg/l. DBS concentrations ranged from 144 to 1518 μg/l. The slope was 0.56 (95% CI, 0.51 to 0.61) with an intercept of −41.68 μg/l (95% CI, −93.78 to 10.42). Mean differences between calculated and measured plasma concentrations were −14.3% (method 1), −14.0% (method 2) and −0.6% (method 3); differences were within 20% of the mean in 73%, 85% and 80% of the samples, respectively. The slopes were respectively 0.96 (95% CI, 0.86 to 1.06), 0.95 (95% CI, 0.86 to 1.03) and 1.00 (95% CI, 0.91 to 1.09). Conclusions: Plasma concentrations of nilotinib could be predicted on the basis of DBS. DBS sampling to assess nilotinib concentrations in CML patients seems a suitable alternative for venous sampling.
KW - chronic myeloid leukaemia
KW - dried blood spot
KW - nilotinib
KW - therapeutic drug monitoring
UR - http://www.scopus.com/inward/record.url?scp=85021263147&partnerID=8YFLogxK
U2 - https://doi.org/10.1111/jphp.12757
DO - https://doi.org/10.1111/jphp.12757
M3 - Article
C2 - 28643375
SN - 0022-3573
VL - 69
SP - 1265
EP - 1274
JO - Journal of Pharmacy and Pharmacology
JF - Journal of Pharmacy and Pharmacology
IS - 10
ER -