Moreover, 12 genes from this secreted list (IGF1, LTBP1, SULF1, SFRP2, COL15A1, MMP1, CFI, COL3A1, AGER, WNT7A, CDH13, and CRTAC1) are potentially associated with pulmonary fibrosis. The gene discussed is COL15A1; the disease is pulmonary fibrosis.