We measured mean fluorescence intensities (MFI) of HLA-DR and molecules associated with dendritic cells (CD141, CD1c, CD163, CD11c, CD123, and CD303), monocytes (CD14 and CD16), granulocytic markers (CD15 and CCR3), co-stimulatory molecules (CD86 and CD275), and chemokine receptors (CCR2, CCR3, and CCR7) from RA patients and healthy donors by spectral flow cytometry. This evidence concerns the gene CD1C and rheumatoid arthritis.