Shinoura et al. reported low levels of CD55/CD59 by Northern blot analysis in meningioma tissues [41] while Domingues et al. reported high levels of these regulatory proteins in meningioma cell membranes by flow cytometry and Affymterix GEP [42, 43] that might be associated with tumor response to complement cytotoxicity [43]. The gene discussed is CD55; the disease is meningioma.