The invention relates to a tumour necrosis factor- (TNF-) related apoptosis-inducing ligand (TRAIL) which is capable of selectively signalling through death receptor 4 (DR4), comprising Y at position 189. Preferably the TRAIL further comprises 19 IL and/or 199V; preferably also 201R, 213W and 215D, and/or preferably further comprises 193S. The invention also relates to uses of such TRAIL mutants which are capable of selectively signalling through DR4 in the treatment of cancer, and in the manufacture of medicaments for use in treatment of cancer. Preferably the cancer is chronic lymphocytic leukaemia, mantle cell lymphoma or non-Hodgkin's lymphoma. The invention also relates to kits comprising same.
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