title: Studies on low-level MDR cells.
abstract: Acquired or spontaneous resistance is a major clinical problem in the treatment of cancer. Low levels of MDR gene expression or P-glycoprotein have been correlated with a high level of drug resistance in vitro and a poor response to chemotherapy in some tumors. A strong correlation between MDR mRNA, P-glycoprotein levels and degree of drug resistance has not been found in several resistant model tumor cell lines. In some cell lines at low and high level of resistance different mechanisms seem to be involved.
authors.affiliation: Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Belvedere
authors.forename: E
authors.initials: E
authors.lastname: Dolfini
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents / Q000378:metabolism / Q000627:therapeutic use / Q000633:toxicity; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D004351:Drug Resistance / Q000235:genetics*; D015870:Gene Expression; D006801:Humans; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000378:metabolism*; D009369:Neoplasms / Q000188:drug therapy / Q000235:genetics; D012333:RNA, Messenger / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D012333:RNA, Messenger