AREG and systemic sclerosis: Serum AREG levels were significantly higher for patients with IIM compared with those for HCs and patients with SSc (IIM: median, 20.7 pg/mL (IQR: 11.8–31.9); HC: median, 10.7 pg/mL (IQR: 8.3–11.5); p = 0.025; SSc: median, 11.8 pg/mL (IQR: 8.7–19.0); p = 0.023) (Figure 1A).