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Mismatch Repair01:20

Mismatch Repair

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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Prostate Cancer Risk and DNA Mismatch Repair Deficiency Among Lynch Syndrome Patients.

Linda Rodgers-Fouché1, Nick A Kamkari2, Melany Cruz1

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European Urology Open Science
|December 24, 2025
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Summary
This summary is machine-generated.

Lynch syndrome (LS) patients have an increased risk of prostate cancer (PC), with incidence varying by gene and family history. MMR-deficient PC is linked to higher-risk features, guiding clinical management.

Keywords:
DNA mismatch repair deficiencyHereditary prostate cancerLynch syndrome

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Area of Science:

  • Oncology
  • Genetics
  • Cancer Research

Background:

  • Lynch syndrome (LS) is a hereditary cancer predisposition syndrome.
  • LS increases the risk of gastrointestinal, endometrial, and other cancers.
  • Emerging evidence suggests LS also elevates the risk of prostate cancer (PC).

Purpose of the Study:

  • To investigate the incidence of PC in males with LS.
  • To characterize the clinical and molecular features of PC within the LS population.
  • To identify risk factors and potential screening strategies for PC in LS patients.

Main Methods:

  • Retrospective analysis of adult males diagnosed with LS from an institutional genetic testing registry.
  • Identification of PC diagnoses and assessment of tumor tissue for DNA mismatch repair deficiency (dMMR) via immunohistochemistry.
  • Correlation of dMMR status with LS gene variants (MSH2, EPCAM, MSH6, MLH1, PMS2) and PC risk stratification.

Main Results:

  • Among 235 LS males, 35 developed PC by age 75, with cumulative incidences of 38% for any PC and 26% for clinically significant PC.
  • MMR deficiency (dMMR) was found in 75% of tumors from MSH2/EPCAM PV carriers and 20% from MSH6 PV carriers.
  • dMMR tumors were significantly associated with higher-risk PC (71% of unfavorable intermediate/higher-risk cases) (p < 0.001); no dMMR in lower-risk PC.
  • LS patients with a family history of PC were threefold more likely to develop PC (OR 3.00, p < 0.001).

Conclusions:

  • MMR-deficient PC in LS patients is associated with aggressive clinicopathological features.
  • MMR testing in LS patients with PC can aid clinical management decisions.
  • Targeted PC screening is recommended for LS patients with MSH2, EPCAM, or MSH6 pathogenic variants and/or a family history of PC.