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| 【獎(jiǎng)勵(lì)】 本帖被評(píng)價(jià)6次，作者xuanzixue增加金幣 4.8 個(gè) | |||
xuanzixue鐵蟲(chóng) (正式寫(xiě)手)
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[資源]
Avastin退出乳腺癌治療，抗血管生成藥物應(yīng)該如何避免？
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發(fā)自PNAS的文章：Antiangiogenic agents increase breast cancer stem cells via the generation of tumor hypoxia Antiangiogenic therapy has been thought to hold significant potential for the treatment of cancer. However, the efficacy of such treatments, especially in breast cancer patients, has been called into question, as recent clinical trials reveal only limited effectiveness of antiangiogenic agents in prolonging patient survival. New research using preclinical models further suggests that antiangiogenic agents actually increase invasive and metastatic properties of breast cancer cells. We demonstrate that by generating intratumoral hypoxia in human breast cancer xenografts, the antiangiogenic agents sunitinib andbevacizumab increase the population of cancer stemcells. In vitro studies revealed that hypoxia-driven stem/progenitor cell enrichment is primarily mediated by hypoxia-inducible factor 1α. We further show that the Akt/β-catenin cancer stem cell regulatory pathway is activated in breast cancer cells under hypoxic conditions in vitro and in sunitinib-treated mouse xenografts. These studies demonstrate that hypoxia-driven cancer stem cell stimulation limits the effectiveness of antiangiogenic agents, and suggest that to improve patient outcome, these agents might have to be combined with cancer stem cell-targeting drugs. |
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2013-03-14 18:25:45, 1.47 M
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