CA oral cavity classification. T3N1M0 CA tongue management according to standard ENT textbook in simplified manner

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CA Oral Cavity - Classification & T3N1M0 CA Tongue Management

(Based on AJCC 8th Edition - KJ Lee's Essential Otolaryngology & Cummings Otolaryngology)

PART 1: TNM CLASSIFICATION OF ORAL CAVITY CA

Primary Tumor (T) - ORAL CAVITY SPECIFIC

(Key 8th edition update: Depth of Invasion (DOI) is now incorporated)

Stage	Criteria
Tis	Carcinoma in situ
T1	Tumor ≤2 cm AND DOI ≤5 mm
T2	Tumor <2 cm + DOI >5 mm and ≤10 mm; OR tumor 2-4 cm + DOI <10 mm
T3	Tumor >4 cm OR DOI >10 mm
T4a	Invades adjacent structures: cortical bone, inferior alveolar nerve, floor of mouth, skin of face, or deep (extrinsic) muscles of tongue
T4b	Invades masticator space, pterygoid plates, skull base, or encases carotid artery

Note: For intraoral tumors, superficial erosion of bone/tooth socket alone does NOT qualify as T4.

Regional Lymph Nodes (N) - Clinical Staging (Oral Cavity / HPV- Oropharynx / Hypopharynx)

Stage	Criteria
N0	No regional lymph node metastasis
N1	Single ipsilateral node, <3 cm
N2a	Single ipsilateral node, 3-6 cm
N2b	Multiple ipsilateral nodes, none >6 cm
N2c	Bilateral or contralateral nodes, none >6 cm
N3a	Any node >6 cm (without ENE)
N3b	Single ipsilateral node >3 cm with ENE; or multiple nodes with any ENE

ENE = Extra-Nodal Extension - incorporated in AJCC 8th edition pN staging

Distant Metastasis (M)

Stage	Criteria
M0	No distant metastasis
M1	Distant metastasis present

Overall Stage Grouping

TNM staging grid for oral cavity - KJ Lee's Essential Otolaryngology

TNM Combination	Overall Stage
T1, N0, M0	Stage I
T2, N0, M0	Stage II
T3, N0, M0 OR T1-T3, N1, M0	Stage III
T4a or N2	Stage IVA
T4b or N3	Stage IVB
Any T, Any N, M1	Stage IVC

PART 2: T3N1M0 CA TONGUE = STAGE III

This patient has:

T3: Tumor >4 cm OR depth of invasion >10 mm
N1: Single ipsilateral node <3 cm
M0: No distant metastasis
Overall: Stage III

PART 3: MANAGEMENT OF T3N1M0 CA TONGUE

Step 1 - Workup Before Treatment

Full head and neck examination + panendoscopy
CT neck with contrast / MRI (to assess DOI, bone, and nodal disease)
CT chest / PET-CT (to rule out distant metastasis)
Biopsy confirmation (SCC in most cases)
Multidisciplinary team (MDT) discussion

Step 2 - Primary Tumor Treatment

T3 = Extensive local disease → Surgery is the mainstay

Option	Details
Hemiglossectomy / Partial glossectomy	For lateralized T3 tumors
Near-total or total glossectomy	For larger/midline T3 involvement
Reconstruction	Free flap (radial forearm, anterolateral thigh) to restore form and function
If total glossectomy	May require total laryngectomy to prevent chronic aspiration (though some selected patients can avoid it)

For bone involvement (mandible):

Periosteal involvement → Marginal mandibulectomy
Medullary space invasion → Segmental mandibulectomy

Step 3 - Neck Management (N1 disease)

Primary nodal drainage: Upper jugular (73%) > Submandibular (18%) > Mid-jugular (18%) > Submental (9%)

Since this patient is N1 (clinically node-positive ipsilateral neck):

Modified Radical Neck Dissection (MRND) or Selective Neck Dissection Levels I-IV on the ipsilateral side
Minimum: Selective neck dissection including levels I-III (supraomohyoid)
For midline/ventral tongue tumors: bilateral neck dissections

Step 4 - Adjuvant Treatment (Post-Surgery)

After surgery + neck dissection, pathological assessment drives adjuvant therapy:

Pathological Finding	Recommendation
Clear margins, N1 without ENE	Adjuvant radiotherapy (RT)
Positive margins or >1 node	Adjuvant chemoradiotherapy (CRT)
ENE (Extra-nodal extension)	Adjuvant CRT - cisplatin-based
Perineural/vascular invasion	Consider adjuvant RT

Adjuvant RT dose: typically 60-66 Gy to primary site; 50-54 Gy to elective nodal areas.

Step 5 - Alternative: Non-Surgical Approach

If patient is medically unfit for surgery or refuses surgery:

Definitive concurrent chemoradiation (cisplatin + RT) is an acceptable alternative
For T4 with bone involvement: surgery usually still required

Summary Flow for T3N1M0 CA Tongue

T3N1M0 CA Tongue (Stage III)
          ↓
Surgical candidate? 
     YES → Hemi/Partial or Near-total Glossectomy
            + Ipsilateral MRND/Selective ND (Levels I-IV)
            ± Contralateral Neck ND (if midline tumor)
            ↓
        Pathology Assessment
            ↓
        Adverse features? (ENE, +ve margins, multiple nodes)
            YES → Adjuvant CRT (Cisplatin + RT)
            NO  → Adjuvant RT alone
     
     NO  → Definitive concurrent CRT (if no bone invasion)

Prognosis (Stage III/IV)

5-year survival: 25-40%
Extra-nodal extension significantly worsens prognosis:
- pN- (node negative): 88% disease-specific survival
- pN+/ENE-: 65% disease-specific survival
- pN+/ENE+: 48% disease-specific survival

Sources: KJ Lee's Essential Otolaryngology (p. 839-848); Cummings Otolaryngology Head and Neck Surgery (Chapter 91, AJCC 8th edition staging table)

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