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JNCI Journal of the National Cancer Institute 1999 91(4):359-367; doi:10.1093/jnci/91.4.359
© 1999 by Oxford University Press
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Journal of the National Cancer Institute, Vol. 91, No. 4, 359-367, February 17, 1999
© 1999 Oxford University Press

ARTICLES

Microvascular Loops and Networks as Prognostic Indicators in Choroidal and Ciliary Body Melanomas

Teemu Mäkitie, Paula Summanen, Ahti Tarkkanen, Tero Kivelä

Affiliation of authors: Department of Ophthalmology,Helsinki University Central Hospital, Finland.

Correspondence to: Tero Kivelä, M.D., Vitreoretinal and Oncology Service, Department of Ophthalmology, Helsinki University Central Hospital, Haartmaninkatu 4 C, P.O. Box 220, FIN-00029 HYKS, Finland (e-mail: tero.kivela{at}helsinki.fi).

BACKGROUND: Malignant melanoma of the ciliary body and choroid of the eye is a tumor that disseminates frequently, and 50% of the diagnosed patients die within 10 years. We investigated the hypothesis that, by histopathologic analysis of the arrangement of microvessels (i.e., small blood vessels) in loops and networks, we might be able to differentiate better those patients with a favorable prognosis from those with a poor prognosis. METHODS: We conducted a population-based, retrospective cohort study of melanoma-specific and all-cause mortality for 167 consecutive patients who had an eye surgically removed because of malignant choroidal or ciliary body melanoma during the period from 1972 through 1981. Microvascular loops and networks were evaluated independently by two pathologists who were unaware of patient outcome. RESULTS: Microvascular patterns could be assessed in 134 (80%) of 167 melanoma specimens. The 10-year probability of melanoma-specific survival was worse if microvascular loops (0.45 versus 0.83; two-sided P<.0001) and networks (0.41 versus 0.72, two-sided P<.0001) were present. In multivariate Cox regression analysis of melanoma-specific survival, the hazard ratios were 1.66 (95% confidence interval [CI] = 1.19-2.30) for the presence of loops and networks as a combined three-category variable, 2.36 (95% CI = 1.37-4.05) for the presence of epithelioid cells, 1.11 (95% CI = 1.03-1.19) for the largest basal tumor diameter (evaluated as a continuous variable), and 2.14 (95% CI = 1.25-3.67) for ciliary body involvement. CONCLUSIONS: Patients with malignant uveal melanoma who have a favorable prognosis can be distinguished from those with a poor prognosis by histopathologic analysis of microvascular patterns in uveal melanoma tumor specimens.


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