Immunohistochemical detection of multidrug-resistant protein expression in retinoblastoma treated by primary enucleation

Matthew W. Wilson, Charles H. Fraga, Christine E. Fuller, Carlos Rodriguez-Galindo, John Mancini, Nikolaus Hagedorn, Markos L. Leggas, Clinton F. Stewart

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


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 x 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/Pglycoprotein (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.

Original languageEnglish
Pages (from-to)1269-1273
Number of pages5
JournalInvestigative Ophthalmology and Visual Science
Issue number4
StatePublished - Apr 2006

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


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