Intrathecal ciliary neurotrophic factor delivery for treatment of amyotrophic lateral sclerosis (phase I trial)

Neurosurgery
R PennJ M Cedarbaum

Abstract

This Phase I trial of ciliary neurotrophic factor (CNTF) delivered intrathecally for the treatment of patients with amyotrophic lateral sclerosis was designed to determine the safety of this new mode of administration as well as the pharmacokinetics and drug distribution. CNTF was administered using a drug pump implanted into the lumbar subarachnoid space in each of four patients with amyotrophic lateral sclerosis. Escalating doses (0.4, 0.8, 1.6, 4, and 8 micrograms/h) were infused for 48 hours per week in 2-week cycles until the highest tolerated dose was achieved. Patients were observed for side effects, and standardized muscle and respiratory function tests were performed. Cerebrospinal fluid (CSF) levels of CNTF were determined using simultaneous lumbar and cervical taps. Plasma and CSF levels of antibodies, CSF cells and protein, and routine blood chemistries were monitored, as were weight and vital signs. Pharmacokinetic studies of four patients demonstrated that the distribution and clearance of recombinant human (rH)CNTF are similar to those of many small, water-soluble agents (morphine, baclofen, clonidine) and that the steady-state concentration of rHCNTF at the cervical level was 18 to 36% of that at the lumbar leve...Continue Reading

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