Answer:
Blood tests that are specific for antigens released from tumors, or antibodies produced in response to tumors, are referred to as **"tumor markers"** or **"biomarkers."** These tests are used in oncology (the study of cancer) to aid in the diagnosis, monitoring, and management of cancer patients by detecting the presence of specific substances associated with cancer cells or the body's immune response to cancer. Common tumor markers include prostate-specific antigen (PSA) for prostate cancer and CA-125 for ovarian cancer, among others.