Concord Medical Services Holdings, a leading operator of radiotherapy and diagnostic imaging centers in China, filed on Tuesday with the SEC to raise up to $100 million in an initial public offering. The Beijing-based company, which was founded in 2007 and booked $36 million in sales over the last 12 months, plans to list on the NYSE under the symbol CCM. Morgan Stanley, J.P. Morgan, and CICC are the lead underwriters on the deal, for which pricing terms were not disclosed.