Cancer cells are typically classified by uncontrolled cell growth and cell division leading to a mass of unwanted cells called a tumor. Besides, many cancer cells have an ability to relocalize to distant tissues and these distant settlements of cancer cells consequently account for the major cause of death in cancer.Carcinogenesis is a complicated multi-step process in which initiation and progression of cancer in cells involve genetic/epigenetic aberrations of human genome. A typical cancer cell does not result from a single mutation, but rather the multiple mutations of numerous genes. Such alterations in the genome lead to either over-activation (e.g. proto-oncogenes) or inactivation (e.g. tumor suppressor genes) of specific groups of genes. Altered regulation of such genes in cancer cells eventually causes uncontrolled-cell proliferation, invasion, and metastasis. Understanding regulation of the gene expression is thus necessary for development of novel efficient cancer therapy.Maspin (Mammary Serine Protease Inhibitor) is belonging to a SERPIN superfamily of proteins. Several studies have revealed the tumor suppressor role of Maspin as an effective inhibitor of cancer cell invasion, metastasis and angiogenesis (1). Maspin is originally found in normal mammary epithelial cells, but reduced or absent in carcinomas cells. Re-expression of Maspin in carcinoma cell lines leads to inhibition of cell invasion and metastasis both in vitro and in vivo (2, 3). Therefore,Maspin becomes a promising target for both prognosis/diagnosis and therapeutic intervention against cancer.