LONDON – Evox Therapeutics Ltd. has validated its exosome drug delivery technologies in a $882 million deal with Takeda Pharmaceutical Co. Ltd., in which the partners will develop protein replacement and messengerRNA (mRNA) therapies in five rare disease indications. As an indicator of the potential therapeutic power of exosome delivery, the lead program in the collaboration rests on the ability of exosomes to cross the blood-brain barrier and deliver a correct copy of the NPC1 gene, to treat the inherited neurodegenerative disorder, Niemann-Pick type C.