No significant differences in mRNA expression for ABCB1, ABCB3, ABCC2 or ABCG2 were observed between carboplatin resistant ovarian cancer cell lines (OVCAR-5 CBPR and CaOV3 CBPR) and parental cells (OVCAR-5 and CaOV3) [Figure 4B-E]. This evidence concerns the gene ABCC2 and ovarian cancer.