“…In contrast to this, Magal Haes et al found significant change in leiomyoma volume after 3 years. [14][15][16][17] Patients with anovulatory cycles suffer from loss of progesterone effect on the endometrium leading to proliferation of endometrium due to unopposed action of estrogen. Also, the recent theory suggests that the absence of progesterone results in reduced endometrial stromal cell factor, reduced plasminogen activator inhibitor-1 production, increased matrix metalloproteinase activity and increased angiogenic factor expression.…”