COL18A1 and heart failure: Patients with heart failure (HF) showed significantly increased plasma/serum levels of osteoglycin [97], glypican‐4 [98], endocan [99], syndecan‐1 [100, 101], syndecan‐4 [102, 103, 104], endostatin [44], and perlecan [105], compared with control subjects.