Compliance with good manufacturing practice (“GMP”) is mandatory for all medicinal products that have been granted a marketing authorisation. Likewise, the manufacture of investigational medicinal products must be in accordance with GMP. Advanced therapy medicinal products that are administered to patients under Article 3(7) of Directive 2001/83/EC1 (so called “hospital exemption”) must be manufactured under equivalente quality standards to the manufacturing of advanced therapy medicinal products with a marketing authorisation.