SYST-08 SURVIVAL ANALYSIS OF METASTATIC MELANOMA PATIENTS WITH BRAIN METASTASIS USING SURVEILLANCE, EPIDEMIOLOGY, AND END RESULTS (SEER)

INTRODUCTION: Melanoma brain metastases (BM) are common and are historically associated with poor prognosis. In the early 2010s, the treatment paradigm for malignant metastatic melanoma shifted with the introduction of immunotherapy (IT). Recent studies suggest that IT provides survival benefits for patients with BM from melanoma primary. The goal of this study was to validate these findings in a large population cohort. METHODS: Data were collected from the Surveillance, Epidemiology and End Results (SEER) database, version 8.3.4 (22 March 2017). Three cohorts were created based on the FDA approval date of IT: ipilimumab (2011), nivolumab (2014), and nivolumab plus ipilimumab (2015) for use in metastatic melanomas. Respectively, the cohorts are defined as the pre-IT era cohort (2010), early-IT era cohort (2011-2015) and late-IT era cohort (2016-2018). One-year overall survival (OS), 2-year OS, and median OS were assessed using a Kaplan-Meier analysis and log rank tests. RESULTS: 1,893 patients were included in this analysis (190 in the pre-IT era, 1,021 in the early-IT era, and 682 in the late-IT era) that had histologically confirmed melanoma with secondary BM at diagnosis. Median OS was significantly increased across the pre-, early-, and late-IT era cohorts, respectively, with the largest increase occurring between the early-IT and late-IT eras (1-year OS: 20.6% vs. 17.0% vs. 38.2%, 2-year OS: 10.5% vs. 14.2% vs. 27.1%, and median OS: 5 vs. 6 vs. 8 months, p < 0.001 by log-rank test). CONCLUSION: The introduction of IT for malignant melanomas has significantly improved the survival outcomes of melanoma patients with brain metastasis. Novel treatment paradigms involving IT with other adjuvant therapies need to be explored to further improve intracranial activity in melanoma patients.