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BACKGROUND Although there is no proven standard therapy for leptomeningeal metastases (LM), treatment often includes intrathecal chemotherapy combined with whole brain radiation therapy (WBRT). Little is known on the toxicity of such combination therapies. We performed a retrospective safety analysis for the combination of intrathecal liposomal cytarabine with WBRT in patients with LM and validated the EANO-ESMO classification in this unique cohort. METHODS Treatment toxicities in patients diagnosed with LM between 2004 and 2014 were retrospectively analyzed according to the RTOG (Radiation Therapy Oncology Group) and NCI CTCAE V5.0 (Common Toxicity Criteria Adverse Events) toxicity criteria. Diagnostic criteria and treatment response as assessed by EANO-ESMO classification were correlated with survival by Kaplan Meier analysis and Breslow test. RESULTS 40 patients with LM who were treated with combined WBRT and intrathecal cytarabine, were identified. Ten patients (25%) experienced adverse events ≥ grade 3 according to the RTOG-toxicity criteria, in 22 patients (55%) CTCAE criteria ≥3 grade were detected. Median overall survival (mOS) was 124.0 days [72.9;175.1]. Median time to neurological progression was 52.0 days [41.1; 62.8]. When comparing the diagnostic criteria, patients with a positive CSF cytology (n=26) showed worse prognosis compared to patients with a negative CSF cytology (n=14) (mOS 84 days [44.0;124.0] versus 198.0 days [162.6;233.4] days, p=0.006, respectively). The EANO-ESMO response assessment correlated significantly with survival - “stable” (n=7) mOS 233.0 [76.5;389.5] days, “response” (n=10) mOS 206.0 [193.9;218.9] days, “progression” (n=17) mOS 45.0 [34.4;55.6] days, “suspicion of progression” (n=6) mOS 133.0 [65.8;200.2] days (overall, p&amp;lt; 0.001). CONCLUSIONS In this retrospective analysis, the treatment combination of WBRT and intrathecal liposomal cytarabine shows an acceptable safety profile. The EANO-ESMO classification for diagnosis and treatment response predicts survival

neuro-oncology

NCMP-14. WHOLE BRAIN RADIOTHERAPY COMBINED WITH INTRATHECAL LIPOSOMAL CYTARABINE FOR LEPTOMENINGEAL METASTASIS – A SAFETY ANALYSIS AND VALIDATION OF THE EANO-ESMO CLASSIFICATION