OLFML2B and gastric cancer: Although there is no study on the expression of OLFML2B and NRBP2 in OV, Houriiyah Tegally et al. showed that OLFML2B is over-expressed in gastric cancer and other cancers [19], Zhiyu Li et al. also showed that NRBP2 was significantly down-regulated in breast cancer tissues [20].