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Cervical node metastasis in T1 squamous cell carcinoma of oral tongue- pattern and the predictive factors.

BACKGROUND: The squamous cell carcinoma (SCC) of the oral tongue is a common cancer in India. Elective lymphadenectomy is generally performed in all patients with T2-T4 tumors. In this study we have tried to analyze the pattern and risk factors associated with lymph node metastasis in T1 tongue cancers.

METHODS: A retrospective review of the records of 57 patients undergoing surgery for treatment of T1 sqamous cell carcinoma of oral tongue was carried out. The clinicopatological features of the tumor, pattern of nodal metastasis and the risk factors associated with lymph node metastasis were studied.

RESULTS: Totally 57 patients with T1 tumor underwent excision of the primary and modified neck dissection (MND). Lymph node metastasis was found in 36.8 % of the patients. Level I to Level II was the commonest site of metastasis. Skip metastasis at level III and IV was found in 8.5 % of the patients and isolated skip metastasis at level IV in 1.5 % of the patients. The risk factors associated with the lymph node metastasis on univariete analysis were; higher grade, tumor size >1 cm and tumor thickness >3 mm. On multivariate analysis only the tumor thickness was found to be a risk factor for the lymph node metastasis (hazard ratio of 21.59).

CONCLUSIONS: T1 sqamous cell carcinoma of tongue is associated with a high incidence of lymph node metastasis. Elective neck dissection should be considered in all patients with tumors more than 3 mm in thickness.

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