MMP9 and inflammatory bowel disease: Other neutrophil-associated IBD biomarkers of potential therapeutic interest include lactoferrin, CXCR1, CXCR2, MMP-9, NGAL, elafin, HNE, pANCAs, MPO, CD16, CD177, CD64, HNPs, SLPI, and PTX3 [252,253,254].