HMGA1 and seminoma: In the present work, we evaluated the correlation between HMGA1 mRNA, Let-7a and miR-26a expression levels (Figure 1A,B) in a seminoma dataset available in the Cancer Genome Atlas (TCGA) database (n = 65) [25], since several studies [20,26,27,28,29] reported that HMGA1 mRNA levels are negatively regulated by both Let-7a and miR-26a.