The expression of two homeobox genes in breast cancer

Breast cancer is one of the main cause of death in women in the world. This cancer is heterogeneous and there are three types including LCIS ،(Lobular carcinoma in situ) ،(Ductal carcinoma in situ) DCIS and carcinoma. Although there are chemotherapy and surgery for its treatment, the molecular mechanism help to diagnosis in the first stage. In this study we aimed to show the expression of CDX1 and CDX2 in breast cancer. In this study, total RNA was extracted from 40 tumor and 40 normal tissues using RNA extraction kit. After cDNA synthesis with Takara cDNA synthesis kit, expressional analysis of CDX1 and CDX2 gene was evaluated by Real time PCR techniques. Our data showed the expression of CDX1 and CDX2 gene were decreased in this cancer, 50 and 45 percent, respectively. Also our statistical analysis demonstrated the underexpression of CDX1 is correlated with tumor size. To the best our knowledge, this is the first study that shows the expression of these gene were reduced in breast cancer. We suggest that these genes have tumor suppressor role in breast cancer and it require more studies to show the main mechanism of these genes in breast cancer