Abstract
A series of cyclic tetrapeptides bearing the bioactive alkylating group on an ϵ-amino-lysyl function have been examined for their antitumoral activity on L1210 and P388 murine leukemia cell lines. One analogue belonging to the chlamydocin family and bearing a β-chloroethylnitrosourea group was found to be potent at inhibiting L1210 cell proliferation and had a higher therapeutic index than the reference compound bis-β-chloroethylnitrosourea (BCNU) on the in vivo P388-induced leukemia model.
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