The invention relates to the use of Sulfestrol (diethylstilbestrol sulfate) in a method of curative or palliative treatment of cancer in a mammal. The inventors have unexpectedly found that Sulfestrol can suitably be employed as an effective drug in the treatment of cancer in mammals. The inventors have further discovered that Sulfestrol can be administered even in high dosages without giving rise to serious side effects. Besides the clinical use of Sulfestrol the present invention also relates to oral dosage units comprising Sulfestrol and to sterile liquids for intravenous administration that comprise Sulfestrol.
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