Tumour DNA was extracted from tumour specimens using NucleoSpin Tissue (MACHEREY–NAGEL, Düren, Germany). Regions of interest for driver genes3 (link),16 (link)–18 (link) were amplified by PCR with gene-specific primers (Supplementary Table S1) and TaKaRa Ex Taq (TAKARA BIO, Shiga, Japan) (IDH1/2, H3F3A, and HIST1H3B) or AmpliTaq Gold 360 (Thermo Fisher Scientific, Waltham, MA) (TERTp) using an Applied Biosystems GeneAmp PCR System 9700 (Thermo Fisher Scientific). PCR products were processed by ExoSAP-IT (Thermo Fisher Scientific), then sequenced with sequencing primer (IDH1) or PCR forward primer as a sequencing primer (IDH2, H3F3A, HIST1H3B, TERTp) and a BigDye Terminator V1.1 Cycle Sequencing Kit (Thermo Fisher Scientific) using the ABI 3130xL Genetic Analyzer (Thermo Fisher Scientific).
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