KRAS mutations are infrequent in gastric carcinomas and have been reported in approximately 6% of cases. Studies have shown no statistically significant difference in survival between KRAS-mutated and KRAS-non-mutated gastric carcinomas. However, one study showed a trend that the presence of a KRAS mutation was associated with better overall survival in gastric carcinoma patients. There is an increased frequency of KRAS mutations in gastric carcinomas with microsatellite instability. In gastric cancer, the predictive ability of KRAS has not been extensively studied, but a small study did not demonstrate an effect on survival in patients treated with an EGFR inhibitor.