Metazym is an experimental recombinant enzyme that was studied in patients with late infantile metachromatic leukodystrophy, but found to be ineffective under the conditions of that trial. A subsequent clinical trial is ongoing. The drug became a source of controversy when a family attempted to purchase the drug for their child before it was approved. Jonckheere, Kingma, Eyskens, Bordon, & Jansen (2023) highlight the shift towards the need for newborn screening for metachromatic leukodystrophy as it allows for improved early detection and timely treatment as well.
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