Gene Variant Detail

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Gene CDKN2A
Variant R80*
Impact List nonsense
Protein Effect loss of function - predicted
Gene Variant Descriptions CDKN2A R80* results in a premature truncation of the Cdkn2a protein at amino acid 80 of 156 (UniProt.org). R80* is predicted to confer a loss of function to the Cdkn2a protein, as demonstrated by loss of Cdk binding (PMID: 8668202).
Associated Drug Resistance

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Transcript NM_000077.4
gDNA chr9:g.21971121G>A
cDNA c.238C>T
Protein p.R80*
Source Database RefSeq
Genome Build GRCh38/hg38
Transcript gDNA cDNA Protein Source Database Genome Build
XM_011517675 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
NM_001195132 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
XM_011517675.2 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
XM_005251343 chr9:g.21970966_21970968delGCGinsTCA c.238_240delCGCinsTGA p.R80* RefSeq GRCh38/hg38
XM_011517676 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
XM_005251343.1 chr9:g.21970966_21970968delCGCinsTGA c.238_240delCGCinsTGA p.R80* RefSeq GRCh38/hg38
XM_011517679 chr9:g.21970966_21970968delGCGinsTCA c.238_240delCGCinsTGA p.R80* RefSeq GRCh38/hg38
XM_011517676.2 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
NM_000077 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
NM_001195132.1 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38
XM_011517679.1 chr9:g.21970966_21970968delCGCinsTGA c.238_240delCGCinsTGA p.R80* RefSeq GRCh38/hg38
NM_000077.4 chr9:g.21971121G>A c.238C>T p.R80* RefSeq GRCh38/hg38

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Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
CDKN2A R80* stomach carcinoma sensitive Palbociclib Preclinical - Cell line xenograft Actionable In a preclinical study, a gastric carcinoma cell line harboring CDKN2A R80* was sensitive to Ibrance (palbociclib) both in culture and in cell line xenograft models (PMID: 26380006, PMID: 20952405). 26380006 20952405
BRAF V600E CDKN2A R80* skin melanoma predicted - sensitive Dabrafenib + Trametinib Case Reports/Case Series Actionable In a clinical case study, a patient with metastatic giant sarcomatoid melanoma harboring BRAF V600E and CDKN2A R80* achieved a partial response following four months of treatment with the combination of Tafinlar (dabrafenib) and Mekinist (trametinib), and reached a complete response with regression of lung and bone metastases after one year of treatment (PMID: 32922664). 32922664
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
CDKN2A inact mut melanoma decreased response unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, treatment with an immune checkpoint inhibitor resulted in a decreased response in melanoma patients with homozygous deletion of CDKN2A or loss of function CDKN2A mutations compared to patients with wild-type CDKN2A in one cohort, with a lower overall survival (OS) of 27.2 mo vs not yet reached and time to treatment failure of 10 vs 20.1 mo, respectively, but in a second cohort, there was no significant differences in OS (PMID: 34074656). 34074656
CDKN2A inact mut renal cell carcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, homozygous deletion of CDKN2A or loss of function CDKN2A mutations in one cohort of renal cell carcinoma patients were not predictive of overall survival or time to treatment failure when treated with immune checkpoint inhibitors, but in another cohort were significantly associated with reduced overall survival compared to wild-type CDNK2A (13 months vs 50 months, P=0.002)(PMID: 34074656). 34074656
CDKN2A inact mut lung non-small cell carcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, homozygous deletion of CDKN2A or loss of function CDKN2A mutations in two cohorts of non-small cell lung cancer patients were not predictive of overall survival or time to treatment failure when treated with immune checkpoint inhibitors (PMID: 34074656). 34074656
CDKN2A inact mut gastroesophageal cancer not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, homozygous deletion of CDKN2A or loss of function CDKN2A mutations in one cohort of esophagogastric cancer patients were not predictive of overall survival or time to treatment failure when treated with immune checkpoint inhibitors, but in another cohort were significantly associated with reduced overall survival compared to wild-type CDKN2A (8 months vs 17 months, P=0.006) (PMID: 34074656). 34074656
CDKN2A inact mut head and neck squamous cell carcinoma not predictive unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, homozygous deletion of CDKN2A or loss of function CDKN2A mutations in two cohorts of head and neck squamous cell carcinoma patients were not predictive of overall survival or time to treatment failure when treated with immune checkpoint inhibitors (PMID: 34074656). 34074656
CDKN2A inact mut bladder urothelial carcinoma decreased response unspecified immune checkpoint inhibitor Clinical Study - Cohort Actionable In a retrospective analysis, treatment with an immune checkpoint inhibitor resulted in a decreased response in urothelial carcinoma patients with either homozygous deletion of CDKN2A or loss of function CDKN2A mutations compared to those patients with wild-type CDKN2A in two different cohorts, with an overall survival for each cohort of 8.8 and 11 mo. versus 25.2 and 19 mo, respectively, and time to treatment failure of 4.2 mo. versus 8.4 mo., respectively, in one cohort (PMID: 34074656). 34074656
CDKN2A mutant skin melanoma not applicable N/A Guideline Risk Factor Germline CDKN2A mutations or polymorphisms are associated with increased risk of developing single or multiple primary cutaneous melanomas (NCCN.org). detail...
CDKN2A mutant biliary tract cancer no benefit Palbociclib Phase II Actionable In a Phase II trial (TAPUR), patients with biliary cancer harboring a CDKN2A mutation or loss of CDKN2A (n=10) did not demonstrate an objective response or stable disease at 16 weeks when treated with single therapy, Ibrance (palbociclib), demonstrating a median progression-free survival of 7.3 weeks and an overall survival of 11.1 weeks (JCO Precision Oncology, Aug 14, 2019; NCT02693535). detail...
CDKN2A mutant lung non-small cell carcinoma predicted - sensitive Palbociclib Phase II Actionable In a Phase II trial (TAPUR), Ibrance (palbociclib) treatment resulted in a disease control rate of 29% (7/28, 1 partial response, 6 stable disease at 16 weeks) in patients with non-small cell lung cancer harboring CDKN2A loss or mutations, with a median progression-free survival of 9.7 weeks and a median overall survival of 20.6 months (J Clin Oncol 37, 2019 (suppl; abstr 9041); NCT02693535). detail...
CDKN2A mutant pancreatic cancer no benefit Palbociclib Phase II Actionable In a Phase II trial (TAPUR), patients with pancreatic cancer harboring a CDKN2A mutation or loss of CDKN2A (n=10) did not demonstrate an objective response or stable disease at 16 weeks when treated with single therapy, Ibrance (palbociclib), demonstrating a median progression-free survival of 7.2 weeks and an overall survival of 12.4 weeks (JCO Precision Oncology, Aug 14, 2019; NCT02693535). detail...
CDKN2A mutant pancreatic cancer not applicable N/A Guideline Risk Factor Germline mutations in CDKN2A results in familial malignant melanoma syndrome, which is associated with increased risk of developing pancreatic cancer (NCCN.org). detail...
Molecular Profile Protein Effect Treatment Approaches
CDKN2A R80* loss of function - predicted CDK Inhibitor (Pan) CDK4 Inhibitor CDK4/6 Inhibitor CDK6 Inhibitor
BRAF V600E CDKN2A R80*