“…There are various kinds of studies using different strategies and animal models to test the efficacy of engineered MSCs for the treatment of cancer/metastasis. In some studies, engineered MSCs were delivered after the tumors or metastatic lesions were established in animal models (Chen et al, 2008;Ren et al, 2008;Xin et al, 2009;Gao et al, 2010;Bak et al, 2011;Conrad et al, 2011;Zhang et al, 2011;Wang et al, 2012;Kim et al, 2013;Lee et al, 2013;Martinez-Quintanilla et al, 2013;Yan et al, 2013;Abrate et al, 2014;Altaner et al, 2014;Hu et al, 2014;Harati et al, 2015;Krasikova et al, 2015, Krassikova et al, 2016Lakota et al, 2015;Matuskova et al, 2015;Nouri et al, 2015;Chung et al, 2016;Yan et al, 2017;Yao et al, 2017;Mirzaei et al, 2018;Schug et al, 2018;Segaliny et al, 2019;Suryaprakash et al, 2019). In other studies, tumor cells and engineered MSCs were injected simultaneously in animal models (Fritz et al, 2008;Sasportas et al, 2009;You et al, 2009;Cavarretta et al, 2010;Seo et al, 2011;Altanerova et al, 2012;Fei et al, 2012;Zolochevska et al, 2012;Ahn et al, 2013;Kucerova et al, 2014;…”