CD24, a glycosylphosphatidylinostitol-anchored cell surface protein that functions in differentiation and activation of granulocytes and B lymphocytes (Nielsen et al. 1997), has been reported to be expressed by NP cells of rat and human chordoma (a notochordal-derived tumor) (Fujita et al. 2005). This evidence concerns the gene CD24 and neoplasm.