SDHC and gastrointestinal stromal tumor: The relative mean MGMT expression for dSDH wtGIST caused by an SDHC epimutation (N=4) was −2.563; SD 2.063; vs −2.018; SD 1.119 for dSDH wtGIST caused by germline SDHx mutations (N=12) vs 0.330; SD 0.495 for TK mutant GIST (N=9).