Long-term survival of uveal melanoma patients after enucleation, depending on molecular genetic aberrations

Abstract

Rationale: In the recent years molecular genetic prognostic factors are becoming very important for predicting the course of uveal melanoma (UM). In clinical practice, molecular genetic methods are used to identify patients with a high risk of metastases.Aim: To determine the survival of UM patients after enucleation, depending on molecular genetic aberrations.Materials and methods: Thirty (30) patients with UM aged from 23 to 83 years were examined and treated. In all cases, enucleation was performed. The removed eyes underwent morphological and molecular genetic and cytogenetic analysis (loss of heterozygocity on chromosomes 1, 3 and 8, methylation of the RASSF1A gene, mutations in GNAQ/11 genes, polymorphism of the ABCB1 gene). The median follow-up was 61 months.Results: The cumulative 3-year survival of the UM patients was 77.8 ± 8.0%, and the 5-year survival 63.0 ± 9.0%. The mean survival time was 52.8 ± 3.9 months. The patients with chromosome 3 monosomy showed significantly lower 5-year survival rates than the patients with partial monosomy and without loss of heterozygocity in chromosome 3 (log-rank test, χ2 = 14.111, p = 0.001). The loss of heterozygocity on chromosomes 1 and 8, the methylation of the RASSF1A gene, the mutations in GNAQ/11 genes, and the polymorphism of the ABCB1 gene were not associated with poorer vital prognosis.Conclusion: Molecular genetic aberrations play an important role in predicting the course of the tumor process and determining the risk of hematogenous metastasizing in UM patients. The significant role of chromosome 3 monosomy has been proved. Due to the relatively small cohort (30 patients) and the time factor (analysis of 5-year survival), the role of other molecular genetic changes has not been confirmed, which requires an assessment of not only genetic, but also clinical, echographic and morphological prognostic factors.

Keywords

• uveal melanoma
• genetics
• survival
• molecular genetic changes
• monosomy of chromosome 3
• deletion of chromosome 1
• deletion of chromosome 8
• rassf1a gene methylation
• gnaq / gna11 gene mutations
• abcb1 gene polymorphism