79 Diagnostic Utility of DNA Methylation Profiling in CNS Tumors: A Comparative Study of FFPE and Fresh-Frozen Tissues
DNA methylation–based classification has become an essential adjunct to histopathology in central nervous system (CNS) tumor diagnostics. Although both fresh-frozen and formalin-fixed paraffin-embedded (FFPE) tissues are used for methylation profiling, comparative real-world data on their diagnostic performance r...