title: Absence of structural alterations of the multidrug resistance genes in transitional cell carcinoma.
abstract: Tumor DNA from 27 patients with treated or untreated transitional cell carcinomas of the urinary tract was screened for genomic alterations of the multidrug resistance genes in order to determine whether structural changes of these genes are important in primary urothelial tumors. None of the tumors showed evidence of amplification or rearrangements of either mdr1 or mdr2. The lack of amplification or rearrangements observed in these tumors suggests that structural alterations of the mdr1 and mdr2 genes are not important mediators of drug resistance in TCC.
authors.affiliation: Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY.
authors.forename: E A
authors.initials: EA
authors.lastname: Klein
authors.forename: G
authors.initials: G
authors.lastname: Allen
authors.forename: W R
authors.initials: WR
authors.lastname: Fair
authors.forename: V
authors.initials: V
authors.lastname: Reuter
authors.forename: R S
authors.initials: RS
authors.lastname: Chaganti
mesh_terms: D015139:Blotting, Southern; D002295:Carcinoma, Transitional Cell / Q000188:drug therapy / Q000235:genetics*; D015342:DNA Probes; D004273:DNA, Neoplasm / Q000235:genetics*; D004351:Drug Resistance / Q000235:genetics; D005784:Gene Amplification / Q000235:genetics; D015321:Gene Rearrangement / Q000235:genetics; D006801:Humans; D014571:Urologic Neoplasms / Q000188:drug therapy / Q000235:genetics*
chemical_list: D015342:DNA Probes; D004273:DNA, Neoplasm