<prompt> Answer this question truthfullyWhat are the conditions in which α-fetoprotein AFP is a serum tumor marker elevated, and is there a mnemonic to remember them?  <response>: <reason> α-fetoprotein AFP is a serum tumor marker elevated in hepatocellular carcinoma, endodermal sinus yolk sac tumor, mixed germ cell tumor, ataxia-telangiectasia, and neural tube defects. There is a mnemonic to remember them, which is HE-MAN is the alpha male. 