Squamous Cell Carcinoma
Non-Small Cell Lung Carcinoma
The protein encoded by the RB1 gene is a negative regulator of the cell cycle and was the first tumor suppressor gene identified. The active, hypophosphorylated form of the protein binds transcription factor E2F1. Inactivation of RB1 and loss of RB1 tumor suppressor function has been identified in many early stage cancers. RB1 alterations are found in approximately 8% of non-small cell lung cancers. RB1 S576fs*34 results in early truncation of the RB1 protein and presumably loss of function. The predictive and prognostic significance of RB1 mutations in lung non-small cell carcinoma is undergoing further investigation. It has been suggested that patients with RB1-deficient tumors do not respond to cyclin-dependent kinase (CDK) inhibitors; however, the clinical implication of the loss of a single copy of RB1, as in this patient's case, remains to be fully elucidated. These results should be interpreted in the clinical context.
Ren S, Rollins BJ. Cyclin C/cdk3 promotes Rb-dependent G0 exit. Cell. 2004 Apr
Indovina P, Pentimalli F, Casini N, Vocca I, Giordano A. RB1 dual role in proliferation and apoptosis: cell fate control and implications for cancer therapy. Oncotarget. 2015 Jul 20;6(20):17873-90.
Campbell JD, et al. Distinct patterns of somatic genome alterations in lung adenocarcinomas and squamous cell carcinomas. Nat Genet. 2016 Jun;48(6):607-16.
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