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TP53 structural variants in metastatic prostatic carcinoma.

Deepika Sirohi1, Patrick Devine1, James P Grenert1

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TP53 gene rearrangements are frequent in prostate cancer, especially metastatic cases, often leading to loss of p53 protein expression. This pathway may serve as a biomarker for aggressive disease.

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Area of Science:

  • Oncology
  • Genomics
  • Molecular Pathology

Background:

  • Sequencing data aids in identifying oncogenic drivers and biomarkers for aggressive prostate cancer.
  • TP53 gene alterations are implicated in tumorigenesis.

Purpose of the Study:

  • To investigate the frequency and significance of TP53 structural variants in prostate carcinoma.
  • To determine if TP53 rearrangements correlate with aggressive disease and loss of p53 protein expression.

Main Methods:

  • Clinical sequencing of 30 primary and metastatic prostate carcinomas using a targeted gene panel.
  • Immunohistochemistry to assess p53 protein expression in cases with TP53 rearrangements.

Main Results:

  • Recurrent TP53 structural variants were identified in 27% of cases (36% of metastatic).
  • TP53 rearrangements correlated with loss of p53 protein expression.
  • Concurrent alterations included PTEN loss, TMPRSS2-ERG fusion, and AR/FOXA1 amplification.

Conclusions:

  • TP53 rearrangements represent a frequent mechanism for inactivating this tumor suppressor in prostate cancer.
  • This pathway may serve as a biomarker for aggressive disease.
  • Identifying TP53 rearrangement is crucial for accurate diagnosis of prostate carcinomas with TP53 functional loss.