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CDKN2A
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Interpretation 2131
Tier 2
CDKN2A
Variants
CDKN2A codon(s) 80 frameshift
Primary Sites
Esophagus
Tumor Types
Squamous Cell Carcinoma
Interpretation

CDKN2A gene functions as an important tumor suppressor via induction of cell growth arrest and senescence. Majority of the CDKN2A mutations result in loss or decreased binding to CDK4/6 leading to uncontrolled cell growth through inactivation of RB and p53 pathways. CDKN2A alterations have been reported as frequent mutations in squamous cell carcinomas of different primary sites including the lung, head and neck, and skin. CDKN2A R80* results in a premature truncation and confers a loss of function to the CDKN2A protein as demonstrated by loss of CDK binding. CDKN2A truncating mutations, including R80*, have been described in approximately 4% of esophageal squamous cell carcinomas. CDKN2A/CDKN2B loss may be associated with increased sensitivity to CDK4/6 inhibitors. The efficacy and toxicity profiles of these inhibitors in the context of a variety of cancer types are currently under evaluation in clinical trials. The clinical significance of the loss of one copy of CDKN2A remains to be fully elucidated in squamous cell carcinoma of the esophagus. These results should be interpreted in the clinicopathologic context.

Citations
  1. Cancer Genome Atlas Research Network. Comprehensive genomic characterization of squamous cell lung cancers. Nature. 2012 Sep 27;489(7417):519-25.
  2. Pacifico A, Leone G. Role of p53 and CDKN2A Inactivation in Human Squamous Cell Carcinomas. Journal of Biomedicine and Biotechnology. 2007;2007:43418.
  3. The Cancer Genome Atlas Network *. Comprehensive genomic characterization of head and neck squamous cell carcinomas. Nature. 2015;517(7536):576-582.
  4. Uniprot.org
  5. Parry D, Peters G. Temperature-sensitive mutants of p16CDKN2 associated with familial melanoma. Molecular and Cellular Biology. 1996;16(7):3844-3852.
  6. Song Y, et al. Identification of genomic alterations in oesophageal squamous
  7. cell cancer. Nature. 2014 May 1;509(7498):91-5.
  8. Pan Q, Sathe A, Black PC, et al. CDK4/6 Inhibitors in Cancer Therapy: A Novel Treatment Strategy for Bladder Cancer. Bladder Cancer (Amsterdam, Netherlands). 2017;3(2):79-88.
Last updated: 2018-03-06 18:01:09 UTC
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