PDCD1 and renal cell carcinoma: Figure 3(a) shows that we performed IF staining in RCC tissue microarray. There was a significant positive correlation between CDCA3 and CD8 (Figure 3(b)). However, our study did not observe the correlation between CDCA3 and CD4, FOXP3, CD68, and PD-1 (Figures 3(c)–3(f)).