MMP7 and idiopathic pulmonary fibrosis: On the other hand, blood biomarkers of IPF are preferred because they do not require an effort from the patients and are easy to measure, namely SP-A, SP-D, Krebs von den Lungen-6 (KL-6), matrix metalloproteinase-7 (MMP-7), and chemokine (C-C motif) ligand 18 (CCL18)[5, 6, 19–22].