The repression of CAR T‐cell infiltration was also evident in resected tumours at day 16 with Lck‐Cre;Ptpn2fl/fl;Stat5fl/+ CAR T‐cell cytotoxicity markers (TNF, IFNγ; induced by PMA/ionomycin ex vivo) being reduced to those in Ptpn2fl/fl control CAR T cells (Fig 7C). Here, LCK is linked to neoplasm.