Immunohistochemical results showed that the three germ layer proteins, GFAP (ectoderm) (Figure 3(Da), Db positive; Dc negative), DES (mesoderm) (Figure 3(Dd), De positive; Df negative), and FOXA2 (endoderm) (Figure 3(Dg), Dh positive; Di negative), in the teratoma were positive with abundant cell morphology. The gene discussed is GFAP; the disease is teratoma.