Clinical Report: Depth of Invasion and Contralateral Nodal Metastasis

Overview

This retrospective single-center cohort study examines whether depth of invasion (DOI) predicts contralateral nodal disease (CND) in patients with well-lateralized oral tongue squamous cell carcinoma. The supplied article excerpt describes the study rationale and methods but does not provide cohort results or a DOI threshold identified by the study.

Background

Cervical lymph node metastasis is described as a principal independent predictor of survival in head and neck cancer, and extranodal extension is associated with further survival decline. DOI is incorporated into AJCC staging and has been used to inform management of the ipsilateral clinically node-negative neck, with prior studies supporting DOI greater than 3 mm as a predictor of occult nodal metastasis. By contrast, criteria for treating the contralateral neck in clinically node-negative patients remain inadequately established. The study was designed to assess the association between DOI and CND in well-lateralized oral tongue SCC.

Data Highlights

Key Findings

• The study evaluates DOI as a predictor of contralateral nodal disease in well-lateralized oral tongue SCC.
• The cohort included surgically treated patients diagnosed from 1998 through 2021 at one tertiary academic center.
• CND was defined to include disease in the opposite neck at presentation or contralateral recurrence after treatment.
• The article background reports that prior studies support DOI >3 mm for predicting occult nodal metastasis and informing management of the clinically node-negative neck.
• A prior institutional analysis by Balaguru et al., as summarized in the supplied context, proposed DOI ≥6 mm as a possible threshold associated with increased CND risk.
• The supplied excerpt does not report this study’s sample size, outcome estimates, statistical results, or final DOI cut-point.

Clinical Implications

The supplied material supports DOI as an established consideration in ipsilateral neck management, while noting that criteria for contralateral neck treatment in clinically node-negative patients remain inadequately established. It does not provide the results needed to determine whether this cohort supports a specific DOI threshold for contralateral neck management.

Conclusion

The study addresses an unresolved question: whether DOI predicts contralateral nodal disease in well-lateralized oral tongue SCC. Its findings and any proposed clinical threshold cannot be summarized from the excerpt provided.

Related Resources & Content

1. NCCN, Version 1.2026 -- Head and Neck Cancers
2. ASCO -- Management of the Neck in Squamous Cell Carcinoma of the Oral Cavity and Oropharynx: ASCO Clinical Practice Guideline
3. D’Cruz et al., New England Journal of Medicine, 2015 -- Elective versus Therapeutic Neck Dissection in Node-Negative Oral Cancer
4. Balaguru et al. -- The predictive value of tumor depth of invasion for contralateral neck disease in tongue cancer
5. Sultania et al., ASCO, 2023 -- Margin to Depth of Invasion Ratio: A Significant Predictor of Survival in Patients With Oral Cancer
6. ASCO Publications — Molecular prediction of lymph node metastases using immunohistochemical analysis of primary oral tongue squamous cell carcinomas.
7. ASCO Publications — Molecular prediction of lymph node metastases using immunohistochemical analysis of primary oral tongue squamous cell carcinomas.
8. ASCO Publications — Tumour thickness as a predictor of neck node metastasis at presentation in early T stage squamous cell carcinoma of oral tongue
9. NCCN Version 1.2026: Head and Neck Cancers
10. ASCO Clinical Practice Guideline: Management of the Neck in Squamous Cell Carcinoma of the Oral Cavity and Oropharynx
11. Elective versus Therapeutic Neck Dissection in Node-Negative Oral Cancer
12. The predictive value of tumor depth of invasion for contralateral neck disease in tongue cancer
13. Management of the Neck in Squamous Cell Carcinoma of the Oral Cavity and Oropharynx: ASCO Clinical Practice Guideline - PMC
14. Elective versus Therapeutic Neck Dissection in Node-Negative Oral Cancer | New England Journal of Medicine
15. Nationwide randomised trial evaluating elective neck dissection for early stage oral cancer (SEND study) with meta-analysis and concurrent real-world cohort - PMC
16. The predictive value of tumor depth of invasion for contralateral neck disease in tongue cancer - ScienceDirect
17. Frontiers | A Systematic Review: Is contralateral elective neck dissection or neck radiotherapy indicated in lateralised cT3/T4 N0 oral squamous cell carcinoma?