Extracellular matrix protein 1 (ECM1) is a glycoprotein involved in a number of biological processes such as bone formation, skin differentiation, cell proliferation, and promotes angiostasis. ECM1 is expressed in breast cancer and could participate in cell migration and angiogenesis. Pathologically, ECM1 contributes to the formation and metastasis of several types of cancer including breast, thyroid and hepatocellular cancers. It can be detected in human serum. ECM1 protein is a possible trigger for angiogenesis, tumor progression and malignancies.