We also found six genes in MSS tumors (EYS, FAT4, FSIP2, PCDHA1, RAD50, and RECQL4) and two in MSI tumors (EXO1 and FSIP2) that were clonally mutated in multiple patients and have not been previously identified as drivers of gastric cancer or other cancers. This evidence concerns the gene EXO1 and gastric cancer.