title: Expression of the multidrug resistance-associated protein (MRP) gene in non-small-cell lung cancer.
abstract: We examined the levels of expression of the multidrug resistance-associated protein (MRP) gene quantified by Northern blot analysis in comparison with those of the MDR1 gene determined by reverse transcription-polymerase chain reaction (RT-PCR) in 104 non-small-cell lung cancer (NSCLC) specimens [59 adenocarcinoma (Ad), 40 squamous cell carcinoma (Sq), four large cell carcinoma (La) and one adeno-squamous carcinoma (AdSq)]. Thirty-three (31.7%) of the 104 NSCLC expressed the MRP gene at various levels. The NSCLC showing high (++) levels of MRP gene expression (19 out of 33, 57.6%) were predominantly squamous cell carcinomas (Ad, 5; Sq, 13; La, 1) (P < 0.05). Six of the eight NSCLCs expressing high levels of MRP mRNA and no MDR1 (MRP ++, MDR1-) were squamous cell carcinomas. Sixty-one of the 104 NSCLC patients received chemotherapy with MRP-related anti-cancer drugs [vindesine (VDS) and etoposide (VP-16)]. Twenty-three patients (37.7%) with tumour expressing high or moderate levels of MRP showed significantly worse prognoses than those with non- or low-MRP-expressing tumours (P < 0.05). These results suggest that the level of MRP gene expression is related to the histopathology and prognosis of NSCLC.
authors.affiliation: Department of Pathology, Tokai University School of Medicine, Kanagawa, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Ota
authors.forename: Y
authors.initials: Y
authors.lastname: Abe
authors.forename: Y
authors.initials: Y
authors.lastname: Oshika
authors.forename: Y
authors.initials: Y
authors.lastname: Ozeki
authors.forename: M
authors.initials: M
authors.lastname: Iwasaki
authors.forename: H
authors.initials: H
authors.lastname: Inoue
authors.forename: H
authors.initials: H
authors.lastname: Yamazaki
authors.forename: Y
authors.initials: Y
authors.lastname: Ueyama
authors.forename: K
authors.initials: K
authors.lastname: Takagi
authors.forename: T
authors.initials: T
authors.lastname: Ogata
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics; D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000328:Adult; D000368:Aged; D001483:Base Sequence; D015152:Blotting, Northern; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics*; D018432:Drug Resistance, Multiple / Q000235:genetics; D005260:Female; D015870:Gene Expression; D006801:Humans; D008175:Lung Neoplasms / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction; D011379:Prognosis; D014158:Transcription, Genetic
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D018528:ATP-Binding Cassette Transporters; D027425:ATP-Binding Cassette, Sub-Family C Proteins