There was no significant difference between the IH group and the RA group, but the IHP group exhibited a further significant increase in IFN‐γ levels compared to the RA group (IHP‐20 v.s RA‐20, p < .05), and also showed a further increase compared to the IH group (IHP‐20 vs. IH‐20, p < .001) (Figure 5). This evidence concerns the gene IFNG and isolated hemihyperplasia.