Wednesday 21 April 2004
Definition: Cyclin-dependent kinase 4 also known as cell division protein kinase 4 is an enzyme that in humans is encoded by the CDK4 gene. CDK4 is a member of the cyclin-dependent kinase family.
CDK4 forms a complex with cyclin D. The complex phosphorylates RB, allowing the cell to progress through the G1 restriction point.
amplification and/or overexpression in tumors
- liposarcomas (16160477)
mutations in tumors
- MDM2 and CDK4 immunostains therefore reliably distinguish low-grade osteosarcoma from benign histological mimics, and their combination may serve as a useful adjunct in this difficult differential diagnosis. (20601938)
- Parosteal osteosarcoma and low-grade central osteosarcoma are two types of low-grade osteosarcoma that show similar clinical behaviors, histological features, and genetic background (ie, amplified sequences of 12q13-15, including MDM2 and CDK4).
- Low-grade osteosarcoma is often confused with benign lesions.
Immunohistochemical analysis of MDM2 and CDK4 distinguishes low-grade osteosarcoma from benign mimics. Yoshida A, Ushiku T, Motoi T, Shibata T, Beppu Y, Fukayama M, Tsuda H. Mod Pathol. 2010 Jul 2. PMID: 20601938
Sirvent N, Coindre JM, Maire G, Hostein I, Keslair F, Guillou L, Ranchere-Vince D, Terrier P, Pedeutour F. Detection of MDM2-CDK4 Amplification by Fluorescence In Situ Hybridization in 200 Paraffin-embedded Tumor Samples: Utility in Diagnosing Adipocytic Lesions and Comparison With Immunohistochemistry and Real-time PCR. Am J Surg Pathol. 2007 Oct;31(10):1476-1489. PMID: 17895748
Shimada S, Ishizawa T, Ishizawa K, Matsumura T, Hasegawa T, Hirose T. The value of MDM2 and CDK4 amplification levels using real-time polymerase chain reaction for the differential diagnosis of liposarcomas and their histologic mimickers. Hum Pathol. 2006 Sep;37(9):1123-9. PMID: 16938516