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BACKGROUND Patients with relapsed CNS NGGCTs experience poor outcomes. Our aim to explore prognostic factors that may guide future clinical trials. METHODS A review of clinical trials that included patients with relapsed CNS NGGCTs was performed. RESULTS Seventy-four patients were identified; only 14 patients (19%) were long-term survivors. Patients who relapsed &amp;gt;24 months after initial diagnosis had a survival rate of 47% compared with 15% of patients who relapsed in &amp;lt;24 months after initial diagnosis (p= 0.015). Patient with serum/cerebrospinal fluid (CSF) alpha-fetoprotein (AFP) level &amp;lt;25 ng/ml at relapse had a survival rate of 40% compared with 0% among patients with serum/CSF AFP level &amp;gt;25 ng/ml at relapse (p= 0.0015). Patients who achieved complete response/continued complete response (CR/CCR) by the end of therapy had a survival rate of 59% compared with 3% among patients who had less than CR/CCR by the end of therapy (p= 0.0001). Patients who received marrow-ablative chemotherapy followed by autologous hematopoietic cell rescue (HDCx/AuHCR) at relapse had a survival rate of 33% compared with 9% of patients who did not receive HDCx/AuHCR at relapse (p=0.056). The extent of surgical resection, receiving radiotherapy, and beta-human chorionic gonadotropin levels at relapse were not statistically associated with improved outcomes. CONCLUSION Timing of relapse (&amp;gt;24 months after initial diagnosis), serum/CSF AFP &amp;lt;25 ng/ml at relapse, achieving CR/CCR after treatment were associated with a positive impact on survival. Receiving HDCx/AuHCR at relapse was associated with an improved outcome trend among the patients.

GCT-40. PROGNOSTIC FACTORS FOR PATIENTS WITH RELAPSED CENTRAL NERVOUS SYSTEM (CNS) NON-GERMINOMATOUS GERM CELL TUMORS (NGGCTs)