“…In the study by Morimoto et al , an increased estrogen receptor staining by immunohistochemistry in the fibroadenoma‐like nodules resected from both breasts of the patients with VBH has been reported. However, in another study by Glisoci et al , no increase in estrogen or progesterone receptors has been demonstrated. Therefore, it seems that the estrogen theory for dysregulated breast growth is more complex, and includes not only increased estrogen receptor density in the breast tissue, but also an excess local estrogen production, abnormal estrogen receptor sensitivity, and, possibly, the presence of an estrogen‐like substance in the body, which stimulates receptors when normal level of estrogens is present .…”