Meta-analysis conducted by Kosińska-Kaczyńska et al. included of 7 studies, revealed that sFlt-1/PlGF ratios between COVID-19 positive vs. negative women were higher, 45.8 ± 50.3 vs. 37.4 ± 22.5, respectively (SMD = 1.76; 95% CI: 0.43 to 3.09; p = 0.01) [23]. This evidence concerns the gene PGF and COVID-19.