Yet, in our in vitro cytotoxic assay (Supporting information Fig. 10), we found that IPI‐549‐treated and vehicle CAR T cells killed approximately 50% of the mesothelin‐expressing cancer cells while CAL‐101‐ and TGR‐1202‐treated T cells killed more (∼75%) of them (Fig. 7E). This evidence concerns the gene MSLN and cancer.