CD8A and neoplasm: The results revealed a negative correlation between PPIA expression and the infiltration of B cells (p = 0.0284), CD8 + T cells (p = 0.0364), macrophages (p = 0.0118), and neutrophils (p = 0.0000982), whereas there was no correlation with tumor purity, CD4 + T cells, and dendritic cells (Fig. 11B).