Study of Carcinogenic RIechanisms perhaps also by nlteriiig the potency of the X-hydroxy metabolite whicah is more c~ arciiiogeiiic thaii the A4AF itself. 6 Sirive some~~ olyctiloroflrioreiies show aiititiinior effects, a few of the present cwrnporuids were tested by the CCNSC, brlt the resiilts indicate thttt none of them has c-ytotoxic, effec-ts.