MAPK1 and gastric cancer: The polymorphism MAPK1 rs743409 showed significant association with gastric cancer in the additive model (crude p-value = 0.036, p-value = 0.033 adjusted for PC1 and PC2) but was not considered for further analysis after adjusting for multiple comparisons (crude q-value = 0.157, q-value = 0.145, adjusted for PC1 and PC2).