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Matthew W. Wilson, Charles H. Fraga, Christine E. Fuller, Carlos Rodriguez-Galindo, John Mancini, Nikolaus Hagedorn, Markos L. Leggas, Clinton F. Stewart; Immunohistochemical Detection of Multidrug-Resistant Protein Expression in Retinoblastoma Treated by Primary Enucleation. Invest. Ophthalmol. Vis. Sci. 2006;47(4):1269-1273. doi: 10.1167/iovs.05-1321.
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purpose. To compare the expression of multidrug-resistant proteins in retinoblastoma tumors among eyes treated with primary enucleation.
methods. A group of 18 patients with unilateral retinoblastoma with advanced intraocular disease was selected for the study. All patients had undergone primary enucleation. A histologic specimen from each patient was retrieved from the pathology archives and a tissue gene microarray was constructed (0.6 × 3–4 mm). Standard immunohistochemical techniques were used to study the tissue microarrays for the expression of the ATP-binding cassette (ABC) transporters: breast cancer resistance protein (BCRP; ABCG2), multidrug-resistant protein 1/P-glycoprotein (MDR1/Pgp; ABCB1), multidrug-resistant–associated protein 1 (MRP1; ABCC1), MRP2 (ABCC2), and MRP4 (ABCC4).
results. Of the 18 specimens retrieved, 16 had adequate tissue for study. MRP1 was expressed in 8 (50%) of 16 tumors, and MRP2 was expressed in 5 (31%) of 16 tumors. MDR1/Pgp was found in 2 (12%) of 16 retinoblastomas. MRP4 and BCRP were not detected in any of the tumors studied.
conclusions. The results show that multiple ABC transporters were present in a cohort of sporadic patients with unilateral retinoblastoma who underwent primary enucleation. Studies are planned of the expression of ABC transporters in eyes treated by chemotherapy and/or radiation as a comparison with this group.
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