low passaged colon and rectal carcinoma cells , hct-8 and hrt-18 , as well as normal rectal , colon and foreskin fibroblasts were positive for fibrinolytic activity , while long established ( greater than 100 passages ) cultures of malignant cells ( colon carcinoma , hela , hep-2 , kb ) as well as normal cells ( hei , av3 ) were negative .
C0007113
rectal carcinoma
C0334227
malignant cells