Immunology is Chang's area of expertise and antibody engineering is his focus. Xolair is the first drug successfully developed by Chang's company, Tanox, Inc.
免疫學是張子文的專長，抗體工程是他的專門技術，「索雷爾」則是張子文在美國 Tanox 公司所研發成功的第一種藥物。