Researchers removed tumors after they grew, and then sorted millions of cancer cells to isolate those that had one or more of three surface protein markers -- CD44, CD24, and ESA.

• 肿瘤生长后切除肿瘤，并且从数以百万计的癌细胞中筛选出表达一个或多个表面蛋白标记物（CD44、CD24和ESA）的细胞。