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. 2003;101:275–292.

Molecular pathology of primary intraocular lymphoma.

Chi-Chao Chan 1
PMCID: PMC1358994  PMID: 14971583

Abstract

PURPOSE: To evaluate immunoglobulin heavy chain (IgH) gene rearrangements, cytokines and chemokines, and infectious agents in primary intraocular B-cell lymphoma (PIOL) cells, in order to better diagnose and understand PIOL. METHODS: We studied ocular specimens from 57 patients with PIOL at the National Eye Institute from 1991 to 2001. Specimens were analyzed for IgH gene rearrangements using microdissection and polymerase chain reaction (PCR). We measured vitreal interleukin (IL)-10 and IL-6 levels by enzyme-linked immunosorbent assay. IL-10 mRNA was studied in PIOL cells using microdissection and reverse transcribed (RT)-PCR. Chemokine and chemokine receptor expression was examined by using immunohistochemistry. Infectious DNA of human herpetic virus-8 (HHV-8), Epstein-Bar virus (EBV), and Toxoplasma gondii was detected by using microdissection and PCR and was confirmed with Southern blot hybridization. RESULTS: IgH rearrangement(s) were demonstrated in all 50 tested cases. Cytokine levels were measured in the vitreous of 39 patients. Thirty-one had measurable cytokine levels: 24 of 31 had elevation of IL-10 relative to that of IL-6, and, in contrast, only 7 of 31 had elevation of IL-6 relative to IL-10. IL-10 mRNA was abundant in lymphoma cells of 6 examined cases. Lymphoma cells expressed chemokine receptors of CXCR4 and CXCR5 in three tested cases. HHV-8 DNA was found in 6 of 32 cases (18.8%), EBV DNA in 2 of 21 (9.5%), and T gondii DNA in 2 of 16 (12.5%). CONCLUSIONS: Molecular analyses detecting IgH rearrangements and vitreal levels of IL-10 and IL-6 are useful adjuncts for PIOL diagnosis. A role for specific infectious agents is hypothesized in the pathogenesis of some cases of PIOL. B-cell chemokine is likely involved in attracting PIOL cells into the eye.

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Selected References

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