[In vivo antitumor activity of hydrosoluble derivatives of 7-hydroxycholesterols].

Sodium bis-hemisuccinates of 7 beta- and 7 alpha-hydroxycholesterols are moderately water-soluble. They have been tested intraperitoneally against the murine Krebs-II carcinoma, grown as an ascitic tumour, and their action has been compared with that of usual chemotherapeutic drugs, cyclophosphamide, 5-fluoro-uracil, and methotrexate. The hydroxycholesterol derivatives show a faster and stronger activity (life prolongation), and lead to the complete disappearance of the tumour in about 1/3 of the cases, even with one single injection. Similar results have been obtained (on fewer cases) with two other experimental ascitic tumours, the S-180 sarcoma and the ZHC hepatoma. The mechanism of action is not known; it appears to be very different from that of the usual anti-cancer chemotherapeutic agents.