The ratio of the relative mean fluorescence intensities of the Pgp+/Pgp− ovarian carcinoma (A2780AD/A2780) and the epidermoid adenocarcinoma (KB-V-1/KB-3-1) cell line pairs was 12.7 ± 2.3 and 10.0 ± 1.8, respectively. Here, PGP is linked to ovarian carcinoma.