TUSC3 and gastric cancer: Initially, we investigated the expression status of LncRNA MIR503HG, miR-224-5p and TUSC3 in GC tissues and cells, and the Real-Time qPCR results showed that LncRNA MIR503HG (Figure 1A) and TUSC3 mRNA (Figure 1C) were downregulated, while miR-224-5p (Figure 1B) was significantly upregulated in the cancerous tissues, in contrast with the corresponding adjacent normal tissues collected from GC patients (N = 42).