Veloso et al. (36) evaluated macrophage expression of cluster of differentiation 14 (CD14), 64 (CD64), 80 (CD80), 163 (CD163), and 206 (CD206) in symptomatic apical periodontitis (SAP) and asymptomatic apical periodontitis (AAP) using flow cytometry. This evidence concerns the gene CD14 and periapical periodontitis.