SenoRx, Inc. develops, manufactures and sells minimally invasive medical devices that are used in the diagnosis of breast cancer. The Company’s initial product focus has been biopsy systems and breast tissue markers, and in January 2008, it launched a radiation balloon catheter for localized partial breast radiation therapy. The sale of disposable products, including its breast biopsy probes, radiation therapy products and tissue markers, accounted for 87.3% of the Company’s revenues during the year ended December 31, 2008. The EnCor system, its flagship product for use in breast biopsy procedures, is a minimally invasive vacuum-assisted breast biopsy system. EnCor allows users to obtain multiple biopsy samples with a single probe insertion. As of December 31, 2008, SenoRx, Inc. had an installed base of 776 EnCor systems and it had sold approximately 205,000 EnCor disposable probes.