OLFM4 and neoplasm: Moreover, in the T1a and T1b subgroups of EGC, LNM was only associated with OLFM4 expression (P=0.01) in T1a patients and closely related to intravascular tumor thrombi (P=0.042) and OLFM4 expression (P=0.027) in T1b patients (Table 2).