We compared levels of ABCC3, CPS1, and TRIP6 mRNA and protein expression in various paclitaxel-resistant ovarian carcinoma cell lines; NCI/ADR-RES cell line cross-resistant to paclitaxel, and subclones of SKOV-3 and OVCAR-3 cells (named SKOV-3/RES and OVCAR-3/RES, respectively) with acquired resistance to paclitaxel. This evidence concerns the gene CPS1 and ovarian carcinoma.