We examined the cancer stem cell (CSC)‐like properties of the tumor sphere‐forming cells by using MDA‐MB‐231‐WT and MDA‐MB‐231‐FGFR2‐S252W cells and found that the latter had a significantly stronger tumor sphere‐forming ability than the former (Figure 2G–I). This evidence concerns the gene FGFR2 and neoplasm.