Am currently working with NIVs and am struggling to understand why, if discovered in the 1970s and first utilised as a drug delivery system (DDS) in 1985 (Chemotheraphy), why has their use as a DDS not been more widely used? Only recently (2012), has their use as a DDS been a primary focus with intention to move into human trials. Has it been a technological barrier? (I.e. manufacturing at a commercial scale) or something else?
Any answers or resource you can direct me to would be amazing.
Thanks in advance.