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The utility of 4-hydro-peroxy-cyclophosphamide for testing the selectivity of human tumours cells against cyclophosphamide in vitro was studied. 4-hydro-peroxy-cyclophosphamide in aqueous solution spontaneously decomposes to 4-hydroxy-cyclophosphamide, the primary product of metabolic activation of cyclophosphamide thus representing a new form of "activated" cyclophosphamide. From 31 human tumours including 21 mammarian-, 4 ovarial-, 2 uterine-carcinomas, 2 seminomas, 1 hypernephroma and 1 rectum-carcinoma cell suspensions were made and the effect on the 3H-Uridine- and the 3H-Thymidine-incorporation into the nucleic acids after short time incubation with the effect of 4-hydro-peroxy-cyclophosphamide and 4-hydroxy-cyclophosphamide. 7 malignomas showed high sensitivity both against 4-hydro-peroxy-cyclophosphamide and against 4-hydroxy-cyclophosphamide. No additional inhibitory effect of the peroxyde function besides of that of the alkylating moiety of the molecule was found. Accordingly 4-hydro-peroxy-cyclophosphamide because of its better availibility and stability may be used as "activated" cyclophosphamide in screening tests for cyclophosphamide-sensivity of human tumours in vitro.
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