A neutrophil-related inflammatory factor estimated from plasma concentrations of NGAL, MPO, MIP-1β, IL-8, and TNF in AD patients (n = 109) showed excellent model fit as indicated by above adequate measures of all fit indices (CFI = 1.000, TLI = 1.068, RMSEA estimate = 0.000, RMSEA probability = 0.690, SRMR = 0.038, chi-squared p value = 0.5557). The gene discussed is MPO; the disease is Alzheimer disease.