However, the results of animal cell research by the Chung Shan Medical and Dental College Toxicology Research Center, conducted by the center's chief, Li Hui, proved that the hair dye ingredient PPD can cause cell damage which can lead to cancer.
但是中山醫學院毒理學研究所所長李輝，十年前以動物細胞研究的結果，卻證實染髮劑中的苯胺類（PPD）成分，會造成體細胞遺傳物質病變，亦即所謂的癌症。