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- W2340285364 abstract "Humanized mice engrafted with tumors enable in vivo investigation of the interactions between the human immune system and human cancer. We have recently found that humanized NOD-scid IL2Rγnull (NSG) mice bearing patient-derived xenografts (PDX) allow efficacy studies of check-point inhibitors. Next generation NSG strains include triple transgenic NSG mice expressing human cytokines KITLG, CSF2, and IL-3 (NSG-SGM3). Here we provide a direct comparison of check-point inhibitors evaluation in NSG and NSG-SGM3 mice engrafted with CD34+ human hematopoietic progenitor cells (HPCs) from the same donor and implanted with PDX tumors. Corroborating earlier studies, reconstitution of human immune system in the blood was faster and more robust in NSG-SGM3 compared to NSG recipients throughout the course of the study (18 weeks). Human CD45+ cells reached 25% of total blood cells at week 4 in hu-NSG-SGM3 mice and at week 9 in hu-NSG mice. A majority of blood hCD45+ cells in hu-NSG-SGM3 at week 4 were CD33+ myeloid cells. Circulating hCD3+ T cells reached 10% at week 9 and included regulatory T cells (Tregs), consistent with earlier studies. Hu-NSG mice displayed comparable hCD3+ T cells in the blood only at 12-15 weeks and did not contain Tregs. PDX tumors were then engrafted into partially HLA-matched hu-NSG-SGM3 mice at 9 weeks post engraftment. Two PDX models previously shown to respond to anti-PD1 therapy in hu-NSG mice, BR1126 and LG1306, were used. Treatment with the anti-PD-1 receptor antibody pembrolizumab (Keytruda) significantly reduced tumor growth in both models. Thus, PDX-bearing hu-NSG-SGM3 mice might serve as a new and improved platform for preclinical immuno-oncology efficacy studies. Citation Format: Li-Chin Yao, Mingshan Cheng, Minan Wang, Jacques Banchereau, Leonard Shultz, Karolina Palucka, James G. Keck. Patient-derived tumor xenografts in humanized NSG-SGM3 mice: A new immuno-oncology platform. [abstract]. In: Proceedings of the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; 2015 Nov 5-9; Boston, MA. Philadelphia (PA): AACR; Mol Cancer Ther 2015;14(12 Suppl 2):Abstract nr LB-C01." @default.
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- W2340285364 date "2015-12-01" @default.
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- W2340285364 title "Abstract LB-C01: Patient-derived tumor xenografts in humanized NSG-SGM3 mice: A new immuno-oncology platform" @default.
- W2340285364 doi "https://doi.org/10.1158/1535-7163.targ-15-lb-c01" @default.
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