According to the results, SLC6A8 expression was found to be significantly upregulated in skin cutaneous melanoma (SKCM), thymoma (THYM), and head and neck squamous cell carcinoma (HNSC), whereas the downregulation of SLC6A8 was found in testicular germ cell tumors (TGCT) and lymphoid neoplasm diffuse large B-cell lymphoma (DLBC) (Figure 1B). The gene discussed is SLC6A8; the disease is testicular germ cell tumor.