To investigate the biological function of UCA1 in GC, we set up UCA1 overexpression cell, NCI-N87/UCA1, by transfecting pcDNA-UCA1 into NCI-N87, and set up UCA1 knockdown expression cell, SGC-7901/siUCA1, by transfecting UCA1 siRNA into SGC-7901. The gene discussed is UCA1; the disease is gastric cancer.