We also analyzed the relationship between the mRNA levels of FGFR2, ERBB4, RET, FN1, MMP16, and SOX2 and tumor stages in breast cancer using GEPIA (Figure 3B) and found that the levels of FGFR2 were significantly upregulated in stage I and remained stable across stages II–X. This evidence concerns the gene FGFR2 and breast cancer.