The correlation between <sup>89</sup>Zr-M9346A tumor uptake and treatment response using IMGN853 in FRα<sup>high</sup> TNBC PDX model suggested the potential of <sup>89</sup>Zr-M9346A PET as a noninvasive tool to prescreen patients based on the in vivo PET imaging for IMGN853-targeted treatment.
Moreover, MOv18-IgG1 triggered immune-dependent cancer cell death <i>in vitro</i> by human volunteer and breast cancer patient immune cells, and significantly restricted orthotopic and patient-derived xenograft growth.<b>Conclusions:</b> FRα is overexpressed in high-grade TNBC and postchemotherapy residual tumors.
Taken together, our results show that FRα CAR T cells can mediate antitumor activity against established TNBC tumor, particularly when FRα is expressed at higher levels.