CDK4 and inflammatory myofibroblastic tumor: Copy number analysis revealed copy number gains for cyclin dependent kinase 4 (CDK4) and mouse double minute 2 homolog (MDM2) in the primary IMT, and of CDK4, MDM2, Discoidin Domain Receptor Tyrosine Kinase 2 (DDR2), and Succinate Dehydrogenase Complex II subunit C (SDHC) in the recurrent IMT (Fig. 3).