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Monosomy 3 Predicts Death but Not Time until Death in Choroidal Melanoma

¹From the Tennent Institute of Ophthalmology, Gartnavel General Hospital, Glasgow, Scotland, United Kingdom; the ²University Department of Pathology, Royal Infirmary, Glasgow, Scotland, United Kingdom; the ³Department of Microbiology, University of Glasgow, Glasgow, Scotland, United Kingdom; and the ⁴University Department of Pathology, Western Infirmary, Glasgow, Scotland, United Kingdom.

PURPOSE. To study whether monosomy 3 can predict time until death caused by metastatic melanoma, whether life expectancy can be predicted in patients after surgical excision of a melanoma displaying monosomy 3, and to confirm the prognostic value of monosomy 3 and its correlation with tumor histology.

METHODS. Archival specimens from 71 patients who died of metastatic melanoma and 40 patients who were living or had died of other causes were identified. The number of copies of chromosome 3 was assessed by chromosome in situ hybridization, and monosomy 3 was compared with clinicopathologic features.

RESULTS. Monosomy 3 was detected in 47 of 71 metastasizing melanomas (66.1%) and was significantly associated with metastasis-related death (P < 0.0001). All 40 nonmetastasizing tumors were balanced for chromosome 3 (two copies). In 70% of cases, epithelioid cells and vascular loops in combination predicted the presence of monosomy 3 (P < 0.0001). Among the 71 patients who had died of metastasizing melanoma, there was no difference in time until death between monosomic and balanced tumors. However, a survival curve corrected for age of the patients at the time of surgery suggested that very-long-term survival with monosomy 3 is probably rare.

CONCLUSIONS. Monosomy 3 is an important predictor of death in melanoma and is in some cases predicted by histology. However, death of metastatic disease occurs in a significant number of patients without monosomy 3. There is no significant difference in time until death between metastatic melanomas, with and without monosomy 3. However, survival of patients with tumors displaying monosomy 3 is generally short.

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