1. Decreased expression of DNA topoisomerase I in camptothecin-resistant tumor cell lines as determined by a monoclonal antibody;Sugimoto;Cancer Res.,1990
2. Reduction of drug accumulation and DNA topoisomerase II activity in acquired teniposide-resistant human cancer KB cell lines;Matsuo;Cancer Res.,1990
3. Mechanisms of resistance to etoposide and teniposide in acquired resistant human colon and lung carcinoma cell lines;Long;Cancer Res.,1991
4. Characterization of an etoposide-resistant human ovarian cancer cell line;Kubota;Cancer Chemother. Pharmacol.,1994
5. Molecular cloning of a cDNA of a camptothecin-resistant human DNA topoisomerase I and identification of mutation sites;Tamura;Nucleic Acids Res.,1991