Journal of Pulmonary Medicine

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Outcome of compartment resection locally advanced oral carcinoma extending to infratemporal fossa and correlation with epigenetic factors

Oral cancer has high prevalence in India and is the most common malignancy in our region. 80% of patients present in locally advanced stage. Till the last decade extension into infratemporal fossa (T4b) was considered inoperable and treated with palliative intent. Since 2007, few institutions have treated these cancers by compartment resection of infratemporal fossa with curative intent. We also found overexpression of a nucleolar protein – Nucleoplasmin 1 in these patients. The levels of Nucleoplasmin 1 showed positive correlation with stage and grade of disease. We treated 60 patients with oral cancer extending to infratemporal fossa by compartment resection of infratemporal fossa along with composite resection of the oral cancer and modified radical neck dissection from January 2015 to December 2018. 50 patients underwent reconstruction with pectoralis major myo-cutaneous flap, four with microvascular free tissue transfer and six with forehead flap. Among these patients 25 received Neoadjuvant Chemotherapy. After a mean follow up of two years, 36 patients are alive and disease free. Patients with involvement of posterior half of medial pterygoid or pterygoid plates recurred within six months. Close margins of resection were noted in 15 of the patients who had undergone Neoadjuvant Chemotherapy. All patients in our series underwent post- operative radiotherapy and the patients with close margins or extra nodal spread from lymph node received to post-operative chemotherapy with radiotherapy. 18 patients had local recurrence in infratemporal fossa within a period of one year. Neoadjuvant chemotherapy reduced the bulk of disease but did not benefit disease free survival. Two patients had regional recurrence in cervical lymph nodes. Conclusion: compartment resection of infratemporal fossa provides good loco-regional control in selected cases with locally advanced oral cancers (T4b). Nucleoplasmin 1 expression has positive correlation with stage of the disease. Neoadjuvant chemotherapy offers no advantage in the outcome.

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