Antitumor Activity of the IGF-1/IGF-2-Neutralizing Antibody Xentuzumab (BI 836845) in Combination with Enzalutamide in Prostate Cancer Models.


:Androgen deprivation therapy and second-generation androgen receptor signaling inhibitors such as enzalutamide are standard treatments for advanced/metastatic prostate cancer. Unfortunately, most men develop resistance and relapse; signaling via insulin-like growth factor (IGF) has been implicated in castration-resistant prostate cancer. We evaluated the antitumor activity of xentuzumab (IGF ligand-neutralizing antibody), alone and in combination with enzalutamide, in prostate cancer cell lines (VCaP, DuCaP, MDA PCa 2b, LNCaP, and PC-3) using established in vitro assays, and in vivo, using LuCaP 96CR, a prostate cancer patient-derived xenograft (PDX) model. Xentuzumab + enzalutamide reduced the viability of phosphatase and tensin homolog (PTEN)-expressing VCaP, DuCaP, and MDA PCa 2b cells more than either single agent, and increased antiproliferative activity and apoptosis induction in VCaP. Xentuzumab or xentuzumab + enzalutamide inhibited IGF type 1 receptor and AKT serine/threonine kinase (AKT) phosphorylation in VCaP, DuCaP, and MDA PCa 2b cells; xentuzumab had no effect on AKT phosphorylation and proliferation in PTEN-null LNCaP or PC-3 cells. Knockdown of PTEN led to loss of antiproliferative activity of xentuzumab and reduced activity of xentuzumab + enzalutamide in VCaP cells. Xentuzumab + enzalutamide inhibited the growth of castration-resistant LuCaP 96CR PDX with acquired resistance to enzalutamide, and improved survival in vivo The data suggest that xentuzumab + enzalutamide combination therapy may overcome castration resistance and could be effective in patients who are resistant to enzalutamide alone. PTEN status as a biomarker of responsiveness to combination therapy needs further investigation.


Mol Cancer Ther


Weyer-Czernilofsky U,Hofmann MH,Friedbichler K,Baumgartinger R,Adam PJ,Solca F,Kraut N,Nguyen HM,Corey E,Liu G,Sprenger CC,Plymate SR,Bogenrieder T




Has Abstract


2020-04-01 00:00:00














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    pub_type: 杂志文章


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    journal_title:Molecular cancer therapeutics

    pub_type: 杂志文章


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    journal_title:Molecular cancer therapeutics

    pub_type: 杂志文章


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    journal_title:Molecular cancer therapeutics

    pub_type: 杂志文章


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    journal_title:Molecular cancer therapeutics

    pub_type: 杂志文章


    authors: Liu Y,Starr MD,Brady JC,Rushing C,Pang H,Adams B,Alvarez D,Theuer CP,Hurwitz HI,Nixon AB

    更新日期:2018-10-01 00:00:00

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    journal_title:Molecular cancer therapeutics

    pub_type: 杂志文章


    authors: Sun X,Song Q,He L,Yan L,Liu J,Zhang Q,Yu Q

    更新日期:2016-10-01 00:00:00