CLDN4 and benign prostatic hyperplasia: From 19 BPH sections, consisting of nodules of hyperplastic glands and intervening stroma or stromal nodules (Foster, 2000), claudin-4 staining was strong in 10.5% (2 out of 19) of cases and moderate in 63.2% (12 out of 19) (Figure 6B; Table 2).