Gingival carcinoma: retrospective analysis of 72 patients and indications for elective neck dissection.

ABSTRACT

Gingival squamous cell carcinoma (SCC) is relatively uncommon, and little is known about its metastatic pattern. We retrospectively reviewed 864 consecutive patients with oral SCC who were seen at the University of Maryland Department of Oral and Maxillofacial Surgery (1991-2005), and identified 111 cases of gingival SCC. Inclusion criteria were fulfilled in 72 patients (mean duration of follow up 49 (1-153) months). Mean (range) age was 72 (45-93) years; 41 patients were women and 31 men. Distribution was almost equal mandible 35 and maxilla 37. Forty (56%) were in the early stages (pI/II) and 32 (44%) in the later stages (pIII/IV). Twenty-nine patients had primary neck dissections, of whom 7/21 had clear, and 6/8 invaded, cervical nodes. The total number of occult nodal metastases was 9/29 (31%) in the mandible and 14/35 in the maxilla (one patient with initially clear nodes had both invaded nodes at neck dissection and a recurrence in the neck). The number of early compared with late stage occult metastases was 4 of 20 patients (20% T1/T2) and 5 of 9 patients (55% T3/T4) in the mandible and 2 of 22 patients (9% T1/T2) and 2 of 13 patients (15% T3/T4) in the maxilla. Two of 9 patients developed occult nodes within T2 maxillary gingival SCC. Bony invasion was identified in 17 patients (24%) occurring in 8 of 19 patients (42%) with invaded nodes compared with 9 of 53 patients (17%) with clear nodes. Overall survival at 2 and 5 years was 53 of 72 patients (74%) and 27 of 72 patients (38%) respectively. Elective neck dissection is indicated for all stages of mandibular gingival tumours and T3/T4 carcinomas of the maxillary gingiva. T2 maxillary SCC should be considered for elective neck dissection. Overall disease-free survival was worse among those with cervical metastases (p=0.004) and those who had had marginal resections (p=0.04).