SLC31A1 and germ cell tumor: Additionally, the gene expression analysis of DLAT, FDX1, and SLC31A1 was performed using normal control and Testicular Germ Cell Tumor (TGCT) based on Genotype -Tissue Expression (GTEx) and the Cancer Genome Atlas (TCGA) databases using the Gene Expression Profiling Interactive Analysis 2 (GEPIA2) database (http://gepia2.cancer-pku.cn, accessed on 25 October 2025).