ScienceDaily (Mar. 26, 2008) — It is well established that Id1, a gene normally produced only in embryonic development, is reactivated in many ‘solid’ cancers, or carcinomas. In the case of breast cancer, the Id1 gene is active only in the more aggressive and metastatic varieties of cancer. Typically those cancers do not possess the oestrogen receptor, and for that reason cannot be treated with Tamoxifen (a drug that interferes with the action of oestrogen), the most effective breast cancer treatment available.
