Treating a human patient having tumour cells located in the rectum, liver, pancras, stomach, skin, glands, lymphatic system, bone, parotid gland, ovaries, uterus, lungs, prostate, thyroid, abdomen or colon comprises administering a mixt. of non-toxic cytostatic alkaloid derivs. (I) in an amt. of 0.5-650 mg, where at least a portion of (I) is comprised of derivs. of chelilutin so as to at least retard the growth of the tumour cells. The alkaloid derivs. may be formed from an alkaloi extract of Chelidonium majus L.. The chelilutin deriv. may be a chelilutin thiophosphoric acid amide salt where the thiophosphoric acid is selected from thiophosphoric acid triaziridide, thiophosphoric acid-tri(N- sanguinarinol)ethylamine, thiophosphoric acid-di (ethyleneimido) -N-herberinol-ethylamide and N,N',N''-triethylene-thiophosphoramide.
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