Clinical Management of Embryonal Tumor with Multilayered Rosettes: The CCMC Experience.

OBJECTIVE: Embryonal tumors with multilayered rosettes (ETMRs) are highly aggressive pediatric brain tumors with poor prognosis. No standard treatment strategy for them exists because of their rarity. This study aimed to share experiences on the clinical diagnosis and treatment of ETMRs at China Children's Medical Center (CCMC).

METHODS: Patients who received a diagnosis of an ETMR between January 2017 and June 2020 were included. Clinical characteristics, such as age of onset, tumor size, stage, tumor site, treatment strategy, and clinical outcome, were retrospectively analyzed.

RESULTS: There were four boys and one girl within 4 years who received a diagnosis during this 4-year timeframe, and were thus included. The average age of morbidity was 29 months (range 16-66 months). The common clinical presentation was headaches and nausea caused by intracranial hypertension. All four patients were chromosome 19 microRNA cluster ( C19MC ) amplification positive. Two patients achieved complete remission, and one patient attained partial remission after multimodal treatment. Of the two deaths, one died from the rapid progression of the disease and another from tumor-related complications.

CONCLUSION: ETMRs are extremely rare brain tumors with a high, early mortality in children. Surgery is the mainstream treatment for ETMRs. Some patients may also benefit from postoperative adjuvant chemotherapy and radiotherapy.