EFNA4 and invasive breast carcinoma: Analysis of EFNA expression showed that the transcriptional levels of EFNA1 (Figure 1(i), P < 0.001), EFNA3 (Figure 1(j), P < 0.001), and EFNA4 (Figure 1(k), P < 0.001) were significantly higher in BrCa than in paracancerous tissues, whereas the transcriptional level of EFNA5 (Figure 1(l), P < 0.001) was significantly lower in BrCa than in paracancerous tissues.