MPO and Cowden disease: Additionally, in a clinical investigation involving pediatric CD patients, the fecal myeloperoxidase (MPO) activity and fecal myeloperoxidase (fMPO) protein concentrations were found to be quasi-predictive of CD diagnosis and active disease, correlating with FC (r = 0.78, p < 0.0001, and r = 0.81, p < 0.0001), yet FC outperformed MPO activity and fMPO protein concentration in predicting CD and the extent of disease-related inflammation [43].