There were no significant differences (p > 0.05) in the concentrations of all parameters (i.e., IGF-1, EGF, NGF, and TGF-β) between the participants meeting the following criteria: presence/absence of gestational diabetes mellitus; presence/absence of hypothyroidism in pregnancy; and type of delivery (natural/caesarean section) in well-controlled maternal conditions. The gene discussed is NGF; the disease is gestational diabetes.