In vivo detection of multidrug-resistant (MDR1) phenotype by technetium-99m sestamibi scan in untreated breast cancer patients(398 views) Vecchio SD, Ciarmiello A, Potena MI, Carriero MV, Mainolfi C, Botti G, Thomas R, Cerra M, D'Aiuto G, Tsuruo T, Salvatore M
Paper type: Journal Article, Research Support, Non-U. S. Gov'T,
Impact factor: 5.036, 5-year impact factor: 4.665
Url: Not available.
Keywords: Atp-Binding Cassette, Sub-Family B, Member 1, Analysis, Autoradiography, Breast Neoplasms, Chemistry, Diagnostic Imaging, Carcinoma, Ductal, Lobular, Drug Resistance, Multiple, Female, Humans, Immunoenzyme Techniques, Middle Aged, Phenotype, Radionuclide Imaging, Sensitivity And Specificity, Technetium Tc 99m Sestamibi,
Affiliations: Medicina Nucleare, Istituto di Scienze Radiologiche, Universita degli Studi "Federico II", Via Pansini, 5, Naples, Italy.,
References: Not available.
In vivo detection of multidrug-resistant (MDR1) phenotype by technetium-99m sestamibi scan in untreated breast cancer patients
Technetium-99m sestamibi is a transport substrate recognised by the multidrug-resistant P-glycoprotein (Pgp). To test whether 99mTc-sestamibi efflux is enhanced in breast carcinomas overexpressing Pgp, we determined the efflux rates of 99mTc-sestamibi and Pgp levels in tumours from 30 patients with untreated breast carcinoma. Patients were intravenously injected with 740 MBq of 99mTc-sestamibi and underwent a 15-min dynamic study followed by the acquisition of static planar images at 0.5, 1, 2 and 4 h. Tumour specimens were obtained from each patient 24 h after 99mTc-sestamibi scan and Pgp levels were determined using 125I-MRK16 monoclonal antibody and in vitro quantitative autoradiography. All breast carcinomas showed high uptake of 99mTc-sestamibi and data from region of interest analysis on sequential images were fitted with a monoexponential function. The efflux rates of 99mTc-sestamibi, calculated from decay-corrected time-activity curves, ranged between 0.00121 and 0.01690 min-1 and were directly correlated with Pgp levels measured in the same tumours (r=0.62; P<0.001). Ten out of 30 breast carcinomas (33%) contained 5 times more Pgp than benign breast lesions and showed a mean concentration of 5.73+/- 1.63 pmol/g of tumour (group A). The remaining 20 breast carcinomas had a mean Pgp concentration of 1.29+/-0.64 pmol/g (group B), equivalent to that found in benign breast lesions. 99mTc-sestamibi efflux from tumours of group A was 2.7 times higher than that observed in tumours of group B (0.00686+/-0.00390 min-1 vs 0.00250+/-0.00090 min-1, P<0.001). The in vivo functional test with 99mTc-sestamibi showed a sensitivity and a specificity of 80% and 95%, respectively. In conclusion, the efflux rate of 99mTc-sestamibi may be used for the in vivo identification of the multidrug resistant (MDR1) phenotype in untreated breast cancer patients.
In vivo detection of multidrug-resistant (MDR1) phenotype by technetium-99m sestamibi scan in untreated breast cancer patients
No results.
In vivo detection of multidrug-resistant (MDR1) phenotype by technetium-99m sestamibi scan in untreated breast cancer patients
Aloj L, Aurilio M, Rinaldi V, D'Ambrosio L, Tesauro D, Peitl PK, Maina T, Mansi R, Von Guggenberg E, Joosten L, Sosabowski JK, Breeman WA, De Blois E, Koelewijn S, Melis M, Waser B, Beetschen K, Reubi JC, De Jong M * The EEE project(532 views) Proc Int Cosm Ray Conf Icrc Universidad Nacional Autonoma De Mexico, 2007; 5(HEPART2): 977-980. Impact Factor:0 ViewExport to BibTeXExport to EndNote
Hesse B, Tagil K, Cuocolo A, Anagnostopoulos C, Bardies M, Bax J, Bengel F, Busemann Sokole E, Davies G, Dondi M, Edenbrandt L, Franken P, Kjaer A, Knuuti J, Lassmann M, Ljungberg M, Marcassa C, Marie PY, Mckiddie F, O'connor M, Prvuolovich E, Underwood R * 3. 0 T perfusion MR imaging(911 views) Rivista Di Neuroradiologia (ISSN: 1120-9976), 2004; 17(6): 807-812. Impact Factor:0.023 ViewExport to BibTeXExport to EndNote