Masahito Takada

Impact of lymph node metastasis on the pattern of failure and survival in oral carcinomas

BACKGROUND Carcinomas of the oral cavity present a high risk for neck metastases that decrease the disease control and survival. METHODS A total of 106 patients with squamous cell carcinoma of the oral cavity who had metastatic neck nodes were studied. The impact of neck metastasis and treatment modalities on outcome was assessed. RESULTS Thirty-eight patients developed neck recurrence or distant metastasis. The 5-year survival, neck recurrence-free, and distant metastases-free rates were 56%, 84%, and 77%, respectively. Univariate analyses showed extranodal spread (ENS), number of positive nodes, and adjuvant chemotherapy were predictors for survival. In multivariate analysis, ENS and postoperative radiotherapy were of borderline significance. There was no prognostic factor for neck control. The presence of ENS and lower levels of positive nodes and no chemotherapy were associated with high distant failure rates. CONCLUSIONS To prevent distant metastases, patients with ENS should be considered for adjuvant chemotherapy.

Squamous Cell Carcinomas of the Mandibular Alveolus: Analysis of Prognostic Factors

Background: To assess the effect of clinicopathologic factors on local tumor control and survival in patients with mandibular alveolar carcinoma. Methods: Fifty patients with mandibular alveolar carcinoma treated surgically were included in this study. There were 3 patients with T1, 25 with T2, 5 with T3, and 17 with T4 disease. Clinical evidence of bone invasion was noted in 47 patients. A hemi- or segmental mandibulectomy was performed on 37 patients, whereas 10 patients had a marginal mandibulectomy. The impact of clinicopathologic variables on local tumor control and patient survival was assessed by univariate analysis. Variables included T and N stage, dental extraction, treatment modality, tumor differentiation, nodal status, surgical margin, and bone invasion. Results: Eleven patients (22%) develop recurrent disease, including 8 local recurrences, 1 neck, and 2 distant metastases. Overall, the 5-year actuarial rates of local control and disease-specific survival were 85 and 73%, respectively. Most local recurrences after surgical treatment were caused by inadequate resection margins. When resection margins were negative, the survival and local control rate were significantly better than when there were positive resection margins (survival, 91 vs. 11%; local control, 100 vs. 49%; p < 0.01). Neither T and N stages, clinical stage, tumor differentiation, dental extraction, bone invasion, extent of bone resection, nor treatment modality influenced outcome. Conclusions: The status of surgical margins was of major importance for the outcome of patients with gingival carcinoma of the mandible.

The impact of extranodal spread of lymph node metastases in patients with oral cancer

A retrospective study of 61 patients with histologically confirmed lymph node metastases was undertaken to evaluate the prognostic significance of extranodal spread (ENS) of metastases on the patterns of treatment failure and survival. ENS was present in 28 (46%) of the 61 patients and it was significantly associated with N stage. T stage, clinical stage, number of positive nodes, level of metastases, mode of treatment, and histological differentiation, however, did not influence the incidence of ENS. The 5-year disease-specific survival rate was 57%. The values for patients with and without ENS were 40% and 72%, respectively, which were statistically significant. The univariate analysis showed that the presence of ENS was a significant predictor of patient survival (P = 0.008). The number and level of positive nodes and postoperative radiotherapy had no prognostic importance. ENS, however, was also associated with an increased risk of distant metastases.

Effects of bisphosphonate (pamidronate) on bone resorption resulting from metastasis of a squamous cell carcinoma: Report of an autopsy case and evaluation of bone resorbing activity in an experimental animal model

PURPOSE This study evaluated the ability of bisphosphonate to prevent bone resorption induced by metastatic tumor cells. MATERIALS AND METHODS Autopsy specimens of a bone metastasis from a woman with a primary squamous cell carcinoma of the tongue who developed multiple osteolytic lesions and hypercalcemia and was treated with pamidronate were studied histologically, histochemically, and ultrastructurally. In an animal experiment, cultured tumor cells (1 x 10(5)) obtained from a metastatic submandibular lymph node in the same patient were injected in the left ventricle of nude mice, and a resulting metastatic bone lesion was studied histologically and histochemically. RESULTS In the autopsy specimens, despite the presence of many resorption lacunae on bone surface, only a few small tartrate-resistant acid phosphatase (TRAPase)-positive cells were observed, and most of them were stained weakly and detached from the bone surface. In the animal experiment, 1 of 10 animals (10%) formed osteolytic bone metastasis, and many TRAPase-positive cells were observed histochemically. CONCLUSIONS Biphosphonate inhibits bone resorption induced by tumor, possibly by decreasing the number of osteoclasts and inhibiting their function.