MEDB-05. Survival and prognostic factors in childhood medulloblastoma: A China single center experience from 2006 to 2015

OBJECTIVE: Medulloblastoma (MB) is a malignant embryonal tumor that develops especially in childhood, with overall survival (OS) at 5 years of up to 70%. The aim of the study is to explore the clinical profile and outcome among the histo-molecular subgroups in Chinese children. METHODS: A total of 93 patients of MB who underwent surgical treatment at Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine from January 2006 to December 2015. The clinical profile, treatment, and survival patterns are discussed. The relevant statistical analysis was done using SPSS software, version 21.0. RESULTS: At the most recent follow-up date, 15 (16.1%) had been lost to follow-up，78 cases were tested for RNA-seq, of which 54 cases were successful, and 24 cases failed the quality control due to sample quality problems.The male-to-female ratio was 2.4:1, and the patients’ mean age at diagnosis was 5 years (ranged from 4 months to 11 years).The estimated 5-year overall survival and progression-free survival, based on Kaplan-Meier analysis, were 55.1% ± 5.6% and 40.9% ± 5.7%.Multivariate survival analysis showed that progression -free survival were significantly affected by extent of surgery (P=0.026) and postoperative radiotherapy(P＜0.001).Preoperative metastasis (P=0.032) and postoperative radiotherapy (P=0.001) had a significant influence on overall survival. While，the molecular subtypes showed no statistically significant differences in 5-year PFS and 5-year OS. CONCLUSION: Extent of resection of MB and postoperative radiotherapy were the important clinical prognostic factors for survival. In the future, we will continue to expand cases and study the clinical characteristics and prognostic risk factors of different molecular types of medulloblastoma in Chinese children,and to improve the survival rate of children with medulloblastoma.