表4　遺伝子治療臨床研究の開発レベル

Phase	Gene Therapy Clinical Trials
	Number	％
Phase I	801	61.2
Phase I/II	258	19.7
Phase II	205	15.7
Phase II/III	13	1
Phase III	32	2.4
Total	1309

http://www.wiley.co.uk/genmed/clinical/