PSCA and gastric cancer: Through the depth analysis of qRT-PCR data and clinicopathological features of GC patients it was found that the expression of lnc-PSCA-4:2 in the plasma was closely connected to the disease(TNM)stage, vascular invasion and lymphatic metastasis of GC patients, and lnc-MB21D1-3:5 was significantly associated with the degree of differentiation of gastric cancer (Table 2).