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LC-MS/MS determination of alectinib and its major human metabolite M4 in human urine: prevention of nonspecific binding.

Bioanalysis 2017 March
AIM: Alectinib (Alecensa(®)) is an anaplastic lymphoma kinase inhibitor for the treatment of anaplastic lymphoma kinase positive non-small-cell lung cancer, and M4 is its major pharmacologically active metabolite. To characterize the pharmacokinetics and excretion of alectinib and M4 in human urine, a bioanalytical method was required.

RESULTS: An LC-MS/MS method using supported liquid extraction was developed for the determination of alectinib and M4 in human urine over the concentration range 0.5-500 ng/ml. Accuracy ranged from 92.0 to 112.2% and precision (CV) was below 9.6%.

CONCLUSION: The method was successfully employed to determine alectinib and M4 concentrations in urine samples from a clinical mass balance study. Addition of the surfactant Tween-20 to urine prevented nonspecific binding of the analytes.

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