Biomarkers are molecules that indicate normal or abnormal process occur in your body. Biomarkers may be produced by the cancer tissue itself or by other cells in the body in response to cancer. It is especially used for the identification of breast cancer. They can be found in the blood, stool, urine, tumor tissue and bodily fluids. Cancer biomarkers can include Proteins, Gene mutations (changes), Gene rearrangements, Extra copies of genes, Missing genes and Other Molecules Biomarkers helps in cancer research to diagnose the early stage cancers, find out the aggressiveness and develop cancer drugs.