As HMGA1 can promote cell proliferation during cancer development, we used the TIMER database to analyze the impact of HMGA1 in immune infiltration, after determining the multiple types of copy number alterations (CNAs) of HMGA1 that were significantly correlated with the infiltration levels of several immune cells in STAD, both in HMGA1 deletion and amplification (Figure 7A and Table S1). This evidence concerns the gene HMGA1 and cancer.