IL17B and gastric cancer: Human umbilical cord mesenchymal stem cells (HucMSCs) and gastric cancer-derived mesenchymal stem cells (GC-MSCs) were successfully isolated, cultured and characterized as previously described [16].In order to explore whether IL-17B has an effect on MSCs and further influences tumor progression, the hucMSCs and GC-MSCs were treated with rIL-17B for 48 hours, and washed with PBS for two times and incubated for another 48 hours, then this conditioned media was collected.