TP53 and systemic lupus erythematosus: Additionally, a high DDR2 level was associated with PPAR signaling pathway, VEGF signaling pathway, systemic lupus erythematosus, complement and coagulation cascades, and vascular smooth muscle contraction (Figure 6D), while its low expression was in relation to aminoacyl tRNA biosynthesis, oocyte meiosis, cell cycle, and p53 signaling pathway (Figure 6E).