The invention is in the field of therapeutic treatment of tumours. It has been found that the conditioned medium resulting from culturing an adult stem cell capable of differentiating into a plurality of differentiated cell types in a liquid cell culture medium and/or the adult stem cell from which the conditioned medium is obtainable, exert a remarkable anti-tumour effect. The adult stem cell derived conditioned medium preferred in this therapeutic application is a cell free conditioned medium derived from a human liver stem cell (HLSC-CM).
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