Ciliary body Lymphangiogenesis in uveal melanoma with and without extraocular extension

Abstract

PURPOSE: To determine whether peritumoral ciliary body lymphatics are found in uveal melanoma in the absence of extraocular extension.

DESIGN: Consecutive case series from 1999 to 2005.

PARTICIPANTS: Thirty-two uveal melanoma cases involving the ciliary body from the Ophthalmic Pathology Laboratory, University of Toronto, of which 23 showed no extraocular extension.

METHODS: All immunofluorescence studies and quantitative analyses were performed in a masked fashion. Sections were immunostained for the presence of lymphatic endothelium using podoplanin (D2-40 antibody) and blood vessel endothelium using CD34.

MAIN OUTCOME MEASURES: Identification and quantification of D2-40-positive lymphatic vessels in the ciliary body.

RESULTS: In every case (n = 32), D2-40-positive lymphatics were detected in the peritumoral ciliary body. Lymphatic signal was significantly increased in the peritumoral ciliary body compared with the nonperitumoral ciliary body (P < 0.0001). There was no difference in lymphatic signal between cases with and without extraocular extension (P > 0.05). Lymphatics were not detected within the tumors.

CONCLUSIONS: Peritumoral lymphangiogenesis was present in the ciliary body in uveal melanomas with and without extraocular extension, and as such, the presence of peritumoral lymphatics is not recommended as a prognostic marker in uveal melanoma.