FN1 and gastric cancer: To evaluate whether Trop2 affects the EMT phenomenon in GC cells, we over‐expressed Trop2 in MGC803 and knockdown Trop2 expression in BGC823, then examined the expression of the epithelial marker (E‐cadherin) and mesenchymal markers (fibronectin and vimentin) by Western blot (Figure 1C) and qRT‐PCR (Figure 1D).