IGFBP6 and neoplasm: The IGFBP6 expression level had a significant positive correlation with the level of infiltrating dendritic cells (r = 0.414, P=9.78e − 19) and negatively correlation with the level of tumor purity (r = –0.459, P=3.22e − 23), B cells (r = –0.182, P=1.77e − 04), and neutrophils (r = –0.114, P=1.99e − 02) (Figure 7).