STC2 and keloid: Compared to normal group, the relative expression levels of SDC4, NOX4, DAMM1, and STC2 in keloid fibroblasts were 0.28 ± 0.13, 2.07 ± 0.32, 2.11 ± 0.63, and 1.87 ± 1.56, respectively (Figure 8).