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Representative fluorescence in situ hybridization results in ossifying fibroma. A Ossifying fibroma, case 9 was the only case to show MDM2 amplification (MDM2:CEP12 ratio 5.0:1). B, C All remaining ossifying fibromas were negative for MDM2 amplification regardless of MDM2 and CDK4 immunohistochemical status; B JTOF, case 16; C OF, case 1
