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Molecular assessment of histopathological staging in squamous-cell carcinoma of the head and neck
J A Brennan1, L Mao, R H Hruban
1Department of Otolaryngology-Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2195.
Background:
Surgical oncologists rely heavily on the histopathological assessment of surgical margins to ensure total excision of the tumor in patients with head and neck cancer. However, current techniques may not detect small numbers of cancer cells at the margins of resection or in cervical lymph nodes.
Methods:
We used molecular techniques to determine whether clonal populations of infiltrating tumor cells harboring mutations of the p53 gene could be detected in histopathologically negative surgical margins and cervical lymph nodes of patients with squamous-cell carcinoma of the head and neck.
Results:
We identified 25 patients with primary squamous-cell carcinoma of the head and neck containing a p53 mutation who appeared to have had complete tumor resection on the basis of a negative histopathological assessment. In 13 of these 25 patients, molecular analysis was positive for a p53 mutation in at least one tumor margin. In 5 of 13 patients with positive margins by this method (38 percent), the carcinoma has recurred locally, as compared with none of 12 patients with negative margins (P = 0.02 by the log-rank test). Furthermore, molecular analysis identified neoplastic cells in 6 of 28 lymph nodes (21 percent) that were initially negative by histopathological assessment.
Conclusions:
Among specimens initially believed to be negative by light microscopy, a substantial percentage of the surgical margins and lymph nodes from patients with squamous-cell carcinoma of the head and neck contained p53 mutations specific for the primary tumor. Patients with these positive margins appear to have a substantially increased risk of local recurrence. Molecular analysis of surgical margins and lymph nodes can augment standard histopathological assessment and may improve the prediction of local tumor recurrence.
Insights
Molecular analysis detected p53 mutations in head and neck cancer margins and lymph nodes missed by standard pathology. Positive margins indicate a higher risk of local recurrence, improving tumor detection and recurrence prediction.
Area of Science:
- Oncology
- Molecular Pathology
- Head and Neck Cancer Research
Background:
- Histopathological assessment of surgical margins is crucial for head and neck cancer treatment.
- Current methods may fail to detect minimal residual disease at resection margins or in lymph nodes.
Purpose of the Study:
- To investigate the utility of molecular techniques for detecting p53 gene mutations in histopathologically negative surgical margins and lymph nodes.
- To assess the correlation between molecularly detected tumor cells and local recurrence risk in head and neck squamous-cell carcinoma.
Main Methods:
- Utilized molecular techniques to identify p53 mutations in surgical margins and lymph nodes from head and neck cancer patients.
- Compared molecular findings with standard histopathological assessment and patient outcomes (local recurrence).
Main Results:
- p53 mutations were detected in 38% of initially negative surgical margins in patients with head and neck squamous-cell carcinoma.
- Patients with molecularly positive margins showed a significantly higher rate of local tumor recurrence (P=0.02).
- Molecular analysis identified neoplastic cells in 21% of histopathologically negative lymph nodes.
Conclusions:
- Molecular analysis, specifically detecting p53 mutations, can identify residual tumor cells missed by standard histopathology in head and neck cancer specimens.
- Positive molecular findings in surgical margins are associated with a substantially increased risk of local recurrence.
- This molecular approach can augment traditional assessment, improving the prediction of local tumor recurrence in head and neck cancer patients.