title: Nuclear expression of YB-1 protein correlates with P-glycoprotein expression in human breast carcinoma.
abstract: Drug resistance is a common clinical problem in cancer treatment. The overexpression of P-glycoprotein appears to be closely associated with multi-drug resistance to anticancer agents. YB-1 binds to the Y-box in the promoter region of MDR1, which encodes P-glycoprotein. We evaluated the correlation between nuclear YB-1 and P-glycoprotein expression and other molecules, such as hormonal receptors, angiogenic factors, immune factors, and methalloprotease in 63 human breast cancers. Nuclear YB-1 expression had a significant correlation with P-glycoprotein and PgR expression, and also with CD68 grade, concerning accumulation of tumor associated macrophages. This series did not demonstrate P-glycoprotein and nuclear YB-1 expression might be one of the useful prognostic marker of breast cancer.
authors.affiliation: Breast Oncology, Tokyo Metropolitan Komagome Hospital, 3-18-22, Honkomagome, Bunkyo-ku, 113-8677, Tokyo, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Saji
authors.forename: Masakazu
authors.initials: M
authors.lastname: Toi
authors.forename: Shigehira
authors.initials: S
authors.lastname: Saji
authors.forename: Morio
authors.initials: M
authors.lastname: Koike
authors.forename: Kimitoshi
authors.initials: K
authors.lastname: Kohno
authors.forename: Michihiko
authors.initials: M
authors.lastname: Kuwano
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000378:metabolism*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000175:diagnosis / Q000378:metabolism* / Q000473:pathology; D022762:CCAAT-Enhancer-Binding Proteins / Q000378:metabolism*; D002467:Cell Nucleus / Q000378:metabolism*; D004268:DNA-Binding Proteins; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008875:Middle Aged; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D011379:Prognosis; D016019:Survival Analysis; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D022762:CCAAT-Enhancer-Binding Proteins; D004268:DNA-Binding Proteins; D051839:NFI Transcription Factors; D009687:Nuclear Proteins; D014157:Transcription Factors; D051840:Y-Box-Binding Protein 1; C070856:YBX1 protein, human