More importantly, NK cell infiltration in the CLDN6-CAR1 NK p.t. group was higher than that in the CLDN6-CAR1 NK i.v. group as detected by flow cytometry, which further warranted the therapeutic effects of CLDN6-CAR1 NK cells to treat ovarian cancer (Fig. 4J). Here, CLDN6 is linked to ovarian carcinoma.