DNMT3B and seminoma: The relapse-free survival rate of patients with seminomas showing focal DNMT3B expression was as low as that of the 16 examined patients with stage I non-seminomatous TGCTs who underwent orchiectomy at the NCCH, Tokyo, Japan (P = 0.747; Figure 3), although previously patients with seminomas have been generally considered to have a more favourable outcome than those with non-seminomatous TGCTs.