Tumor-associated antigens (TAA) have elevated levels on tumor cells, but are also expressed at lower levels on healthy cells. Tumor markers are useful in helping to detect, diagnose and manage some types of cancers. The level of present tumor markers can sometimes reflect the stage (extent) of the disease or the patient’s prognosis (the likely outcome or the course of disease) for some types of cancers. Many tumor-associated antigens have been identified and targeting them is considered as an important approach in cancer immunotherapy.

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