In December 1999 ALA was authorized by FDA as a photodynamic medicine to treat skin cancer in prophase. And it is drawing more and more attentions of scientists to apply it in the treatment of various epidermis cancers.

• 1999年12月，美国FDA正式批准ALA为治疗皮肤癌前期的光动力药物，ALA在治疗其它表皮癌症中的应用也得到了越来越多科学家的兴趣。