Preoperative MMP-9 levels in nasal secretions were found to show an inverse correlation with quality of healing after sinus surgery (Watelet et al. 2004), while MMP-9 in wound fluid obtained at 24 hours after inguinal hernia surgery showed an inverse correlation with collagen deposition at 10 days (Agren et al. 1998). This evidence concerns the gene MMP9 and Inguinal hernia.