You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which one of the following is not used as a tumor marker in testicular tumors? and explain in detail?
CEA is an oncofetal antigen and may be used as a tumor marker in adenocarcinoma of colon, pancreas, lung, breast, and ovary. However not used as a marker for germ cell tumorsTumor markers for germ cell tumors:Alpha-fetoprotein seen in non-seminomatous germ cell tumorsHCG: 1. non-seminomatous germ cell tumors; 2. Non-seminomatous germ cell tumorsOthers:LDHPlacental alkaline phosphatase(Ref: Harrison's 18/e p652, table 81-6)