CTBP1 and ovarian cancer: In order to investigate whether the CTBP1-DT lncRNA and/or DDUP contributes to cisplatin resistance, patient-derived ovarian cancer cells (PDOVCs), which are expected to resemble ovarian cancer cells in clinical tumor tissues, were isolated from two CDDP-sensitive ovarian cancer tissues and denoted as PDOVCs#1 and PDOVCs#2, and from two CDDP-resistant ovarian cancer tissues and denoted as PDOVCs#3 and PDOVCs#4.