Fire patienter (tre i fase 3 undersøgelsen og en i fase 2 undersøgelsen) udviste marginal til lav hæmning in vitro af laronidase- enzymatisk aktivitet, der ikke syntes at påvirke den kliniske effekt og/ eller reduktion af GAG i urinen.
Four patients (three in the Phase 3 study and one in the Phase 2 study) showed marginal to low level in vitro inhibition of laronidase enzymatic activity, which did not appear to impact clinical efficacy and/ or urinary GAG reduction.