摘 要: | Nowadays the levonorgestrel-releasing subcutaneous implant,Norplant,is oneof the major methods of female contraception because of its convenience,safety andlong-term efficiency.However,being a single-progestin contraceptive,itmay causeabnormal endometrial-bleeding as one of the majorside effects and can cause discon-tinuation of Norplant using[1 ,2 ] .Its mechanism is not completely known,althoughmany researchers have studied on this subject.VEGF,b FGF and TGF-β1 had been detected in endo…
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