LONDON – With five expensive advanced therapies recently approved in Europe and a further five expected to get approval in the near term, it is vital the hurdles that delay and preclude access – and which have led to the commercial failure of earlier products – are removed.

In late May, Novartis AG's Avexis Inc. unit gained FDA approval for Zolgensma (onasemnogene neparvovec) to treat spinal muscular atrophy, and other companies are looking to follow suit developing drugs to treat a variety of diseases of the central nervous system (CNS).