Medulloblastoma/primitive neuroectodermal tumor in 45 adults

Area of Science:

• Neuro-oncology
• Pediatric and Adult Brain Tumors
• Medical Oncology

Background:

• Medulloblastoma/primitive neuroectodermal tumors (PNET) are rare in adults, presenting unique clinical challenges.
• Understanding adult PNET presentation and treatment response is essential for improving outcomes.

Purpose of the Study:

• To review the clinical characteristics, treatment outcomes, and recurrence patterns of medulloblastoma/PNET in adult patients.
• To evaluate the efficacy of standard treatment protocols in the adult population.

Main Methods:

• Retrospective review of medical records for 45 adult patients (≥15 years) diagnosed with medulloblastoma/PNET.
• Analysis of presenting symptoms, diagnostic findings, treatment modalities (surgery, radiation, chemotherapy), and follow-up data.
• Categorization of recurrence patterns, including local, CNS dissemination, and systemic metastasis.

Main Results:

• Most adult patients presented with posterior fossa tumors.
• Despite initial response to multimodal therapy, approximately 50% of patients experienced recurrence.
• Recurrences were predominantly CNS dissemination or systemic metastasis, rather than local relapse.

Conclusions:

• Adult medulloblastoma/PNET requires treatment strategies similar to those used in pediatric patients.
• The high rate of non-local recurrence underscores the need for comprehensive staging and surveillance.
• Long-term follow-up is critical for identifying late and distant recurrences in adult PNET survivors.