Patients 2307 and 2334 were withdrawn after one and three doses of Vγ9Vδ2 T cells due to aspiration pneumonia and bacterial infection of the central venous catheter, respectively (although both patients experienced relief of their clinical symptoms and showed promising signs of immunological reactivity reflected by induction of IFN-γ and the reduction of tumor cells in ascites). This evidence concerns the gene IFNG and aspiration pneumonitis.