OCT4 is a transcription factor critical for the pluripotency of human embryonal stem (ES) and induced pluipotency stem (IPS) cells. OCT4 is commonly expressed in germ-cell tumors as well as putative cancer stem cells in several tumors, and is a key determinant of oncogenic fate in germ-cell tumors. The capacity of the human immune system to recognize this critical stem-cell gene is not known, b...

Objective: We report a case that we believe to be the largest example of a testicular mixed germ cell tumor with a clearly defined histology pattern. Clinical Presentation and Interventions: A 21-year-old patient consulted a urologist concerning a giant testicular mass. At the time of presentation the tumor measured 29 ! 20 ! 16 cm, with a weight of 4,850 g. Serum ·-fetoprotein was over 15,000 ...