PDTM-42. CROSS-PLATFORM PROFILING OF ctDNA USING ddPCR: STANDARDIZATION OF THE LIQUID BIOPSY FOR PEDIATRIC DIFFUSE MIDLINE GLIOMA

摘要

Pediatric diffuse midline glioma (DMG) with histone H3 mutations (80%), are highly morbid tumors with poor response to therapy. We previously detected H3 mutations in circulating tumor DNA (ctDNA) from CSF derived from children with DMG and high grade glioma. Here, we describe a high-throughput, sensitive and specific approach for H3 mutation detection and quantification in plasma and CSF specimens, validated across multiple centers.