however , when the criteria for positive drug activity consisted of the attainment of tumor regressions of greater than or equal to 50 % in greater than or equal to 20 % of the treated individuals ( i.e. , analogous to clinical criteria ) , only the three drugs that are known to be active against human breast cancer ( pam , ctx , and fura ) were judged active against the spontaneous murine breast tumors .
C0086418
human
C1173297
ctx