SURG-10. MELANOMA CEREBRAL METASTASES IN IRELAND- GETTING UNDER THE SKIN

BACKGROUND: Ireland has the highest rate of melanoma related deaths in Europe. Despite the incidence of melanoma reaching record highs there remains a paucity of information in Ireland regarding the factors associated with melanoma brain metastasis (MBM). METHODS: Patients diagnosed with MBM in Ireland were retrospectively identified in Beaumont Hospital between 1999 and 2018. Patient demographics; year of detection of MBM, age at diagnosis of primary melanoma, age at detection of MBM, anatomical location of primary melanoma, BRAF mutation analysis and the number of metastases were investigated. Follow up data was also derived, including overall survival (OS). RESULTS: The incidence of malignant melanoma has increased by 158% over the past 20 years with 1,092 and 422 cases diagnosed in 2018 and 1999, respectively.128 patients with melanoma brain metastases were identified during this period. The median OS after detection of MBM was 5 months (95% CI 0.641–9.359 months). There was a male predominance (n= 77/128; 60%) with a median age of death at 58 years (n=67; range 16–82 years). Although females had a significantly longer time between diagnosis of primary melanoma and detection of MBM compared to males, 4 and 2 years respectively (p=0.02442), there was no significant age difference at death between males and females (p= 0.41294). BRAF mutation was an independent prognostic factor with an improved overall survival compared to those without the mutation, of 8 months and 3.5 months respectively (p=0.0012). Although non significant, the primary location of melanoma, leptomeningeal disease and number of cerebral metastases were all important considerations in this group. CONCLUSIONS: Male predominance and BRAF mutation represent important factors in this population group. The results of this study add to our knowledge concerning outcomes in melanoma brain metastases in Ireland, and may be useful in clinical planning, educational programs and future treatments.