TGFB3 and keratoconus: Patients with KC had significant decrease in TGF-β1 (KC versus control; = 25429.14 ± 25940.15 versus 38857.60 ± 13482.19 pg/mL; p = 0.008) and TGF-β3 (950.01 ± 498.500 versus 1236.30 ± 218.88 pg/mL; p = 0.046; Mann–Whitney U test) levels (Figure 3(c)).