Cancer Biomarkers: Exploring Their Role in Early Detection and Treatment Monitoring A biomarker refers to any biological molecule found in blood, other body fluids, or tissues that is a sign of a normal or abnormal process, or of a condition or disease. For cancer, biomarkers can indicate the presence or absence of cancer as well as the stage of disease progression. They can also predict a patient's response to treatment or risk of cancer recurrence. Several types of molecules...