CHATSWORTH, Calif.--(BUSINESS WIRE)--North American Scientific, Inc. (Nasdaq:NASI) today announced that it received a Staff determination letter from The Nasdaq Stock Market (“Nasdaq”) dated October 15, 2007 indicating that, based on the Nasdaq Staff’s review and the materials submitted by the Company, the Nasdaq Staff has determined to deny the Company’s request for continued listing on The Nasdaq Global Market. As previously announced by the Company on September 25, 2007, the Company had received a notice from Nasdaq that the Company does not comply with the minimum $10 million stockholders’ equity requirement under Maintenance Standard 1 for continued listing on The Nasdaq Global Market set forth in Marketplace Rule 4450(a)(3). In addition, the Company does not comply with the alternate minimum $50 million market value of listed securities requirement under Maintenance Standard 2 for continued listing on The Nasdaq Global Market, and for 30 consecutive business days, the bid price of the Company’s common stock has closed below the minimum $1.00 per share requirement for continued inclusion under Marketplace Rule 4450(a)(5).