The mRNA transcripts of ITGB2 (CD18), ITGAM (CD11b), CFP, CFD, and C5AR1 were upregulated in monocytes derived from patients with ITP, suggesting the enhancement of complement‐mediated phagocytosis in these monocytes (Figure 3E). This evidence concerns the gene C5AR1 and autoimmune thrombocytopenic purpura.