Recurrence Pattern Analysis of Primary Glioblastoma

Area of Science:

• Neuro-oncology
• Surgical Oncology
• Cancer Recurrence Patterns

Background:

• Glioblastoma typically recurs locally within 2 cm of the original tumor.
• Advances in surgical techniques enable more aggressive resection, increasing complete resection rates.
• This study examines if improved resection impacts glioblastoma recurrence patterns.

Purpose of the Study:

• To investigate the recurrence patterns of glioblastoma following aggressive surgical resection.
• To correlate recurrence patterns with extent of resection, molecular factors, and survival outcomes.
• To inform future surgical strategies for improved glioblastoma local control.

Main Methods:

• Retrospective analysis of 97 glioblastoma patients (2007-2014) with standard adjuvant radiochemotherapy.
• Classification of recurrence patterns: local, distant, or combined.
• Correlation of recurrence patterns with extent of resection, MGMT methylation status, clinical status, and survival data.

Main Results:

• Local recurrence was observed in 79.3% of patients; distant and combined patterns occurred in 10.3% each.
• Median progression-free survival was 7 months for local, 13 months for distant, and 9 months for combined recurrence.
• Median overall survival was 21 months for local, 20 months for distant, and 14 months for combined recurrence.
• No correlation found between MGMT methylation status and recurrence pattern.

Conclusions:

• Despite complete resection, glioblastoma predominantly recurs locally.
• Distant glioblastoma recurrence is associated with improved progression-free survival.
• Consideration of more aggressive supramarginal resection with intraoperative monitoring may enhance local control and improve outcomes.