RTHP-27. RARE INTRACRANIAL PRIMARY YOLK SAC TUMORS IN ADOLESCENT PATIENTS: A REPORT OF 10 CASES DEPARTMENT OF ONCOLOGY

Abstract

Abstract OBJECTIVE To retrospective analyze 10 patients with intracranial primary yolk sac tumors(YST) for exploring an optimal treatment strategy. METHODS Ten patients with YST were confirmed by pathological diagnosis (9 male and 1 female), with a median age of 13 years. Except for 1 case was lost to follow-up, 9 patients were treated with partial resection, followed by WBRT and local boosts, and then adjuvant chemotherapy. The time it took for serum AFP to decrease to the lowest level (including abnormal situation) or to return to the normal level was recorded. The brain tumor apoplexies before and after treatment were studied. Finally, OS and PFS of the patients were analyzed. RESULTS The patients were followed-up to 02-2019, with a mean follow-up time of 25.44 months. The analysis showed that the mOS and mPFS were 18 months and 7 months, respectively, and that 1y-OS and 2y-OS were 77.8% and 22.2%, while 1y-PFS and 2y-PFS were 22.2% and 11.1%. The time it took for serum AFP to decrease to the lowest level or to return to the normal level was 0–382 days, with a median time of 144 days (165.22±131.71 days). After being followed-up to 02-2019, 4 patients still survived; 4 patients died of tumor recurrence; 1 patient died of severe pneumonia. Although one of the 4 patients (tumor recurrence) was treated with 3 times of surgeries, died of tumor progression, with a survival time of 17 months. The other one patient had a 1y-PFS of 3 months, and he received surgery and chemotherapy for recurrent tumors, achieving a 2y-PFS up to 71+ months. CONCLUSION YST has a low incidence rate and is easy to recurrence, with a poor prognosis. Resection combined with chemoradiotherapy can prolong the survival time of patients, but the optimal treatment strategy remains unclear and needs further research.