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. 2020 Jun 10;20:542. doi: 10.1186/s12885-020-06986-z

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 4 — The tumorigenic role of LGR5 in ER⁻ BC. a Gene expression profiles in control and LGR5-KD MDA-MB-231 (MDA) cell lines. KD of LGR5 downregulates canonical Wnt pathway genes, such as β-catenin and Cyclin D (n = 3, Mean ± SD, Student t-test, **P < 0.01, ***P < 0.001). b Colony assay as a surrogate for tumor initiating capacity using single MDA-ctrl and MDA-LGR5KD cells in 3D culture showing number of spheres across increasing days in culture. KD of LGR5 significantly reduces sphere formation when compared to MDA-ctrl (n = 3, Mean ± SD, Student t-test, *P < 0.05, **P < 0.01, ****P < 0.0001). c Representative images from resected tumors of 1 × 10⁶ MDA cells transplanted in Matrigel that were allowed to grow in the inguinal mammary gland for 6 weeks. d Weights of resected tumors from MDA-ctrl (n = 4) and MDA-LGR5KD cell lines (n = 4) shows that KD of LGR5 attenuates tumor growth. Mean ± SD. (Student t-test, *P < 0.05)