Subsequently, we compared the number of FOXP3+T-reg with respect to the different clinico-pathological CD subtypes, including, respectively, UCD HV (mean 27 ± 29.07), UCD mixed (mean 24 ± 14.14), MCD HyperV (mean 28.5 ± 6.364), MCD mixed (mean 18 ± 14.03), and MCD PC (mean 22.33 ± 4.509); in this analysis, no statistically significant differences (p = 0.8205) were found. Here, FOXP3 is linked to urea cycle disorder.