The present disclosure relates to a modified Interleukin-1 (IL-1) family member cytokine, with reduced activity via its cytokine receptor, wherein said interleukin-1 family member cytokine is specifically delivered to target cells. Preferably, the IL-1 family member cytokine is a mutant, more preferably it is a mutant IL-1 with low affinity to the IL-1 receptor, wherein said mutant IL-1 is specifically delivered to target cells. The targeting is preferably realized by fusion of the modified IL-1 family member cytokine to a targeting moiety, preferably an antibody or antibody-like molecule. The disclosure relates further to the use of such targeted modified IL-1 family member cytokine to treat diseases.