OLFM4 and gastric cancer: However, in another group of gastric cancer cases of all stages, low expression of OLFM4 was significantly related to poor differentiation (P=0.011), diffuse and mixed type (P=0.031), higher invasion depth (P=0.004), LNM (P=0.008) as well as late TNM stage (P=0.002) (Supplementary Table 1).