FIGURE 6 Correlation between DDR1 expression level and immune markers in STAD and DLBC. (A) Scatterplots of correlation between DDR1 expression level and immunological marker sets of monocytes, TAMs, and M1 and M2 macrophages in DLBC via TIMER database. (B) Scatterplots of correlation between DDR1 expression level and immunological marker sets of monocytes, TAMs, and M1 and M2 macrophages in STAD via TIMER database. (C) Correlation heatmap of DDR1 expression level and immunological marker sets of monocytes, TAMs, M1 macrophages, M2 macrophages, and dendritic cells based on 407 STAD samples from TCGA. (Blank indicates the correlation is not signi fi cant. The p-value cutoff is