Tissue distribution of crizotinib and gemcitabine combination in a patient-derived orthotopic mouse model of pancreatic cancerReport as inadecuate




Tissue distribution of crizotinib and gemcitabine combination in a patient-derived orthotopic mouse model of pancreatic cancer - Download this document for free, or read online. Document in PDF available to download.

ADMET and DMPK, Vol.4 No.4 December 2016. -

Pharmacokinetics focuses on the question whether a drug actually reaches its target in therapeutic concentrations or accumulates elsewhere, potentially causing toxicological or unpredictable side effects. We determined tissue distribution of gemcitabine, an antimetabolite, and crizotinib, a tyrosine-kinase inhibitor targeted against the anaplastic lymphoma kinase ALK and mesenchymal-epithelial transition factor c-Met receptors, in a validated orthotopic mouse model for pancreatic cancer. Mice with pancreatic cancer were treated with either oral crizotinib at 25 mg-kg, gemcitabine at 100 mg-kg or with their combination. Two hours after the last gemcitabine dose mice were sacrificed and all available blood-organs-tissues were sampled. Tissue was subsequently analyzed for drug concentrations using a validated liquid chromatography-mass spectrometry LC-MS-MS technique. In whole blood gemcitabine was about 1.0 μM and crizotinib 2.4 μM in the single treatment, whereas in the combination crizotinib increased the levels of gemcitabine. Crizotinib was found in all major tissues, being highest in the intestine. Comparison of crizotinib alone to the gemcitabine-crizotinib combination showed that crizotinib tissue concentrations were 3-6 fold lower in liver, lung, kidney and spleen, 30-fold lower in the skin, heart and pancreas and 200-fold lower in the brain. Tissue gemcitabine was highest in spleen and skin, being about 5-10 fold higher than in the other tissues, including brain, which still had a relatively high accumulation. In conclusion, both gemcitabine and crizotinib accumulate at clinically active but variable levels in tissues, possibly relating to the effects exerted by these drugs.

Crizotinib; gemcitabine; tissue distribution



Author: Richard J Honeywell - ; Department of Medical Oncology, VU University Medical Center, PO Box 7057, 1007 MB Amsterdam, The Netherl

Source: http://hrcak.srce.hr/



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