Diagnosing relapse in children's brain tumors using metabolite profiles

Area of Science:

• Pediatric Oncology
• Neuro-oncology
• Medical Imaging

Background:

• Malignant pediatric brain tumors have a poor prognosis upon relapse, necessitating improved management strategies.
• Accurate diagnosis of abnormalities during tumor surveillance is challenging, requiring novel techniques.
• This study explores the utility of proton magnetic resonance spectroscopy (¹H MRS) for monitoring pediatric brain tumors.

Purpose of the Study:

• To investigate if metabolite profiles of pediatric brain tumors at relapse reflect those at initial diagnosis.
• To assess the potential of ¹H MRS in aiding the monitoring process of pediatric brain tumors.

Main Methods:

• Single-voxel ¹H MRS was performed on 19 children with grades II-IV brain tumors at diagnosis and suspected first relapse.
• Metabolite concentrations were analyzed using TARQUIN software.
• Paired Student's t-tests compared metabolite profiles between diagnosis and relapse.

Main Results:

• No significant differences in metabolite, lipid, or macromolecule levels were observed between diagnosis and first relapse.
• This stability was consistent across the entire group, local relapses, and distant relapses.
• In 5 cases, MRS findings suggestive of tumor preceded a formal relapse diagnosis, indicating potential for early detection.

Conclusions:

• Pediatric brain tumor metabolite profiles measured by ¹H MRS show minimal changes from diagnosis to first relapse.
• ¹H MRS can be a valuable tool to aid in confirming the presence of tumor during surveillance and monitoring.