Single-use technologies and CDMO expansions have resolved some of the issues in the cell and gene therapy space but analytical and supply chain challenges still exist, says Spark Therapeutics. Spark Therapeutics is one of a handful of companies to achieve regulatory success with an advanced therapy, specifically its gene therapy for inherited vision loss Luxturna (voretigene neparvovec) which received US approval in December 2017. Speaking as part of a panel discussion at the BPI Theater at BIO in Philadelphia last…