RecruitingPhase 1Drug trialPhase 1 Study of GC1130A in Patients With Sanfilippo Syndrome Type A (MPS IIIA)The purpose of this study is to evaluate the safety, tolerability, efficacy, pharmacokinetics and pharmacodynamics of recombinant human heparan N-sulfatase (rhHNS, GC1130A) administered via intracerebroventricular access device in patients with Sanfilippo Syndrome Type A (MPS IIIA).