A positive correlation was detected between DDR1 and tumor mutational burden (TMB) in testicular germ cell tumors (TGCT), STAD, and LUSC (Figure 2C), and between DDR1 and microsatellite instability (MSI) in STAD and acute myeloid leukemia (LAML) (Figure 2D). This evidence concerns the gene DDR1 and gastric adenocarcinoma.