A 58-year-old woman with biopsy-confirmed squamous cell carcinoma of the anterior two-thirds of the tongue (T2N1M0) is being evaluated for treatment planning. Imaging shows a 3 cm primary tumor with a single ipsilateral lymph node (2 cm) and no distant metastases. She is medically fit for surgery. What is the most appropriate next step in management?

Explanation

## TNM Staging and Prognosis **Key Point:** This patient has Stage III oral cavity SCC (T2N1M0), which is locally advanced but potentially curable with multimodal therapy. | TNM Component | Definition | This Patient | |---|---|---| | **T2** | Tumor 2–4 cm | 3 cm primary | | **N1** | Single ipsilateral node ≤3 cm | One 2 cm node | | **M0** | No distant metastases | Confirmed | | **Stage** | III | Curable with surgery ± adjuvant RT | ## Surgical Management Rationale **High-Yield:** Surgery is the primary modality for oral cavity SCC when the patient is medically fit and the tumor is resectable. Wide local excision with adequate margins (≥5 mm) is the standard. 1. **Primary tumor:** Wide local excision (WLE) with 1–1.5 cm margins 2. **Neck dissection:** Selective neck dissection (SND) of levels I–III for N1 disease - Ipsilateral SND is adequate for clinically positive single node - Contralateral neck observation is acceptable if no imaging evidence of contralateral disease 3. **Reconstruction:** Based on defect size (may require flap for larger defects) **Clinical Pearl:** The anterior two-thirds of the tongue has good lymphatic drainage to levels I–III. Selective neck dissection of these levels is appropriate for N1 disease and avoids morbidity of comprehensive neck dissection. ## Adjuvant Therapy Decision After surgery, adjuvant therapy is indicated if: - Positive surgical margins - Extranodal extension (ENE) - Perineural invasion (PNI) - Lymphovascular invasion (LVI) - Multiple positive nodes - Advanced nodal stage (N2–N3) **Mnemonic: PEEL** — Positive margins, Extranodal Extension, Extracapsular spread, Lymphovascular invasion (indications for adjuvant RT or chemoRT) ## Why Surgery is First-Line Here ```mermaid flowchart TD A[T2N1M0 Oral SCC]:::outcome --> B{Medically fit?}:::decision B -->|Yes| C[Resectable?]:::decision C -->|Yes| D[Wide Local Excision + SND]:::action D --> E[Assess pathology for adjuvant therapy]:::action E --> F[Positive margins/ENE/PNI?]:::decision F -->|Yes| G[Adjuvant EBRT or chemoRT]:::action F -->|No| H[Observation with surveillance]:::action B -->|No| I[Concurrent chemoRT]:::action C -->|No| J[Concurrent chemoRT]:::action ``` **Key Point:** Surgery offers the best local control and allows pathological staging to guide adjuvant decisions. Neoadjuvant chemotherapy is not standard for resectable T2N1 disease.