CASE REPORTS
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Monitoring of 7α-hydroxy-4-cholesten-3-one during therapy of cerebrotendinous xanthomatosis: a case report.

Cerebrotendinous xanthomatosis (CTX) is a rare, inherited autosomal-recessive lipid-storage disorder caused by 27-hydroxylase deficiency. In this study, we report of a 30-year old man with this disorder who was treated using chenodeoxycholic acid, simvastatin, and low-density lipoprotein (LDL) apheresis. The LDL apheresis was performed weekly for nine months. The first subjective improvement was reported by the patient after his fourth LDL-apheresis. Spasticity, gait disturbances, and his entire psychomotoric test results had improved tremendously. His fine motoric skills have been regained. The efficacy of LDL-apheresis was monitored using quantitative determination of 7α-OH-4-cholesten-3-one in plasma based on a LC-MS/MS method. The clearance efficacy of 7α-hydroxy-4-cholesten-3-one from the patient's plasma per LDL-apheresis varied between 8% and 53% but returned to the initial high levels after seven days (mean value 241 ng/mL). A slight negative trend in the plasma concentration could be derived over the period of nine months.

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