EPHA2 and sarcoma: To further validate the efficacy of the EphA2‐CAR generated from the 4H5 clone against other sarcoma cell lines, we transfected NK92 cells with EphA2‐CAR mRNA at a lower and MaxCyte‐recommended concentration of 200 μg/mL, as we were observing higher incidences of cell death after electroporation with 15 pmol of mRNA delivered per million NK cells (data not shown).