“…Following the first paper by Leng et al (2020) (see below), a number of data extrapolated from ongoing and concluded clinical studies on COVID-19 patients using both BM-MSCs and umbilical cord MSCs (UC-MSCs), together with reports employing MSCs from other sources or MSC vesicles, with positive results have been published so far ( Al-Khawaga and Abdelalim, 2020 ; Barkama et al, 2020 ; Gentile et al, 2020 ; Golchin et al, 2020 ; Gorman et al, 2020 ; Liang et al, 2020 ; Lin et al, 2020 ; Meng F. et al, 2020 ; Sánchez-Guijo et al, 2020 ; Sengupta et al, 2020 ; Shu et al, 2020 ; Gentile, 2021 ; Jamshidi et al, 2021 ; Kouroupis et al, 2021 ; Moradinasab et al, 2021 ; Payares-Herrera et al, 2021 ; Sharma and Zhao, 2021 ).…”