a substance that may be found in tumor tissue or released from a tumor into the blood or other body fluids. a high level of a tumor marker may mean that a certain type of cancer is in the body. examples of tumor markers include ca 125 (in ovarian cancer), ca 15-3 (in breast cancer), cea (in ovarian, lung, breast, pancreas, and gastrointestinal tract cancers), and psa (in prostate cancer).
出典:Wikipedia
出典:『Wikipedia』 (2011/02/12 12:32 UTC 版)
A tumor marker is a substance found in the blood, urine, or body tissues that can be elevated in cancer, among other tissue types. There are many different tumor markers, each indicative of a particular disease process, and they are used in oncology to help detect the presence of cancer. An elevated level of a tumor marker can indicate cancer; however, there can also be other causes of the elevation.