To assess the protein levels of basal and CDDP-induced NOS in chemosensitive and chemoresistance cells, we cultured OV2008 ovarian cancer cells and the isogenic chemoresistant variant C13* in the absence or presence of CDDP (0–10 μM, 24 h; DMSO control) and evaluated iNOS, eNOS, and nNOS contents by western blot. Here, NOS1 is linked to ovarian carcinoma.