title: Expression of mediated P-glycoprotein multidrug resistance related to Tc-99m MIBI scintimammography results.
abstract: We prospectively studied a total of 24 patients with breast cancer to evaluate the relationship between the degree of accumulation of technetium-99m sestamibi (Tc-99m MIBI) and p-glycoprotein (Pgp) expression in tumor tissues. All 24 patients underwent Tc-99m MIBI scintimammography before surgery or biopsy. Immunohistochemical studies were performed on multiple non-consecutive sections of the same tumor using a Pgp specific monoclonal antibody, JSB-1. Planar images were started 10 min after injection of Tc-99m MIBI. Tumor to background (T/B) ratios calculated from the planar images were correlated with Pgp expression as determined by immunohistochemical studies. The T/B ratios were significantly lower for tumors in eight patients with positive Pgp expression (Group 1) than in 16 patients with negative expression (Group 2) (1.40+/-0.11 and 2.76+/-0.60, P<0. 05). Our data confirmed that Tc-99m MIBI scintimammography is useful for determination of the presence of multidrug resistance due to Pgp expression in patients with breast cancer.
authors.affiliation: Department of Nuclear Medicine, China Medical College Hospital, Taichung, Taiwan.
authors.forename: S S
authors.initials: SS
authors.lastname: Sun
authors.forename: J F
authors.initials: JF
authors.lastname: Hsieh
authors.forename: S C
authors.initials: SC
authors.lastname: Tsai
authors.forename: Y J
authors.initials: YJ
authors.lastname: Ho
authors.forename: J K
authors.initials: JK
authors.lastname: Lee
authors.forename: C H
authors.initials: CH
authors.lastname: Kao
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis*; D000328:Adult; D001692:Biological Transport; D001943:Breast Neoplasms / Q000378:metabolism*; D018432:Drug Resistance, Multiple / Q000502:physiology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008875:Middle Aged; D011446:Prospective Studies; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D017256:Technetium Tc 99m Sestamibi / Q000493:pharmacokinetics*
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi