SDHC and neoplasm: A search of PubMed (using the terms SDHC and methylation or epimutation) identified 8 publications containing 34 cases of SDHC promoter region hypermethylation in a variety of tumour types including dSDH wtGIST, sympathetic (PGL) and parasympathetic (HNPGL) paragangliomas1,9,10,12,13,18 (Table S5).