CAR T cells have made headlines for their ability to fight hematological cancers, but they have proven largely ineffective against solid tumors. To fight such tumors, many groups have engineered T cells to carry T-cell receptors (TCRs) that target cancer antigens, but this approach requires using T cells taken from the patient and it is ineffective against parts of the tumor that have lost expression of the target antigen. As an alternative strategy, researchers at Zelluna ASA in Norway have engineered natural killer (NK) cells to express TCRs against solid tumor antigens.