Lmic-11. Outcomes of Infants With CNS Tumors: Report of 85 Cases From 6 Mexican Hospitals

INTRODUCTION Reports on central nervous system (CNS) tumors in infants from low- and middle-income countries are scarce. This is a high-risk population, we sought to analyze their outcomes in Mexico. METHODS Patients <36 months diagnosed CNS tumors between January 2014 to December 2023 from 6 hospitals in Mexico were included. Demographic, treatment, and outcomes were collected. RESULTS In total, 85 patients with a median age of 21 months were included. Of these, 51 (60%) were male. Diagnoses included low-grade glioma (LGG) in 26 (33%), medulloblastoma (MB) in 19 (22%), other embryonal tumors in 12 (14%), ependymoma (EPN) in 11 (13%), high-grade glioma (HGG) in 6 (7%), and other tumors in 11 (13%). Regarding surgery, a near or gross total resection was achieved in 22 patients (26%). For LGG it was 23%, while it was 37% for for MB, 36% for for EPN, and 17% for HGG. Ten patients (12%) died from postoperative complications. Overall, 12 (14%) patients, including 4 patients with MB, had metastasis at diagnosis. In total, 19 (22%) patients received radiotherapy, including 10 patients who received CSI (average age 35 months) and 9 who received focal radiotherapy, including 6 with EPN, 2 with LGG, and 1 with ATRT. Of patients with MB, 18 (95%) received chemotherapy, including 1 with autologous stem cell transplant and 3 with intraventricular chemotherapy. The 5-year event-free survival was 38±11%, while the 5-year overall survival (OS) was 52±10%. The 5-year OS were: 84±10% for LGG, 43±21% for MB, 55±23% for EPN, 9±25% for other embryonal tumors, and 17±35% for HGG. CONCLUSIONS These data show low survival rates, associated with very poor surgical outcomes. A fraction of patients received CSI radiotherapy, showing deviation from international standards. Further analyses are needed to identify factors that lead to better prognosis.