In addition, in our previous studies we compared the KB-V1 cell line with mdr1 transfected NIH 3T3 murine fibroblast cells [22], and Pgp+ A2780AD ovarian carcinoma cells [23] and found them equivalent in every aspect of their multidrug resistant phenotype including the inhibition of Pgp-mediated drug transport by UIC2 mAb. This evidence concerns the gene PGP and ovarian carcinoma.