MMP7 and cyst: MMP‐7 median serum level was significantly elevated in the cyst group compared with controls (3.7 ng/mL [IQR 2.9–5.0] vs. 2.9 ng/mL [IQR 2.0–4.4]; p = 0.02, respectively) (Figure 1A), while SDC1 median serum level was not significantly different between the two groups (30.1 ng/mL [IQR 26.5–35.4] vs. 31.2 ng/mL [IQR 26.3–35.1]; p = 0.874, respectively) (Figure 1B).