MTOR and Prader-Willi syndrome: The circulating levels of VEGF, mTOR, and MAPK in the PWS group were significantly higher than in the healthy control group, with concentration values of 1159.76 ± 162.83 pg/mL vs. 762.18 ± 199.88 pg/mL, 219.26 ± 54.25 ng/L vs. 108.93 ± 52.47 ng/L, 11.41 ± 2.53 ng/L vs. 6.35 ± 2.42 ng/L (p < 0.0001, p < 0.0001 and p < 0.0001; respectively).