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- W2087525462 abstract "Objective—Previous studies showed that sequential exposure to estrogen and progesterone or medroxyprogesterone acetate (MPA) stimulates vascularization and promotes the progression of BT-474 and T47-D human breast cancer cell xenografts in nude mice (Liang et al, Cancer Res 2007, 67:9929). In this follow-up study, the effects of progesterone, MPA, norgestrel (N-EL) and norethindrone (N-ONE) on BT-474 xenograft tumors were compared in the context of several different hormonal environments. N-EL and N-ONE were included in the study since synthetic progestins vary considerably in their biological effects and the effects of these two progestins on the growth of human tumor xenografts are not known. Methods—Estradiol-supplemented intact and ovariectomized Immunodeficient mice were implanted with BT-474 cells. Progestin pellets were implanted either simultaneously with estradiol pellets 2-days prior to tumor cell injection (i.e. combined), or 5-days following tumor cell injections (i.e. sequentially). Results—Progestins stimulated the growth of BT-474 xenograft tumors independent of exposure timing and protocol, MPA stimulated the growth of BT-474 xenograft tumors in ovariectomized mice and progestins stimulated VEGF elaboration and increased tumor vascularity. Progestins also increased lymph node metastasis of BT-474 cells. Therefore, progestins, including N-EL and NONE, induce the progression of breast cancer xenografts in nude mice and promote tumor metastasis. Conclusions—These observations suggests that women who ingest progestins for HT or oral contraception could be more at risk for developing breast cancer as a result of proliferation of existing latent tumor cells. Such risks should be considered in the clinical setting." @default.
- W2087525462 created "2016-06-24" @default.
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- W2087525462 date "2010-09-01" @default.
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- W2087525462 title "Synthetic progestins induce growth and metastasis of BT-474 human breast cancer xenografts in nude mice" @default.
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- W2087525462 doi "https://doi.org/10.1097/gme.0b013e3181d3dd0c" @default.
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