“…Bjorklund has made antisera against pooled human cancers in horses (112). He has studied the cytotoxic effects of these antisera and has demonstrated that the cytotoxins can be removed by absorption with cancer tissue or by cells from estab lished human cell lines, but cannot be removed by similar absorption with normal human tissue (113). Other encouraging results have been obtained by Grace & Kondo (114), by Finney, Byers & Wilson (115), and by the Grahams (116).…”