<prompt> Marker for seminoma testis is -Alfa - fetoproteinCarcinoembryonic antigensHCGAcid phosphatase  <response>: Normally seminoma cells do not contain AFP and HCG.Approximately 15 of seminomas contains syncytiotrophoblasts which secret HCG --- Robbins 1042Seminoma is positive for placental alkaline phosphatase and keratin. 