The highest frequency of the ALDH1A3 expression was found in teratomas (77.8%), with decreasing trend in GCNIS (74.6%), embryonal carcinomas (71.0%), in choriocarcinomas (63.6%), yolk sac tumors (46.7%) and, at least, in seminomas (42.0%) (Figure 7A–D). This evidence concerns the gene ALDH1A3 and yolk sac tumor.