[Comparison of the antimitotic properties of cyclophosphamide and its biotransformation products on meristema plant cells and animal cells in in vitro culture].

N-mustard diamide phosphoric and above all 4-hydroperoxycyclophosphamide are clearly more cytotoxic than same kind, which is in accordance with the fact that these compounds are the active metabolites of cyclophosphamide. On the contrary, 4-ketocyclophosphamide and carboxyphosphamide, secondary metabolites inapt to be activated, are not more cytotoxic than cyclophosphamide. No tolerance does occur with these metabolites, contrary to cyclophosphamide itself.