Survival and prognostic factors in patients with oral squamous cell carcinoma.

BACKGROUND: This study aimed to evaluate sociodemographic and clinical factors influencing overall survival (OS) in patients with oral squamous cell carcinoma (OSCC). MATERIAL AND METHODS: Medical charts of 547 patients with OSCC from a public hospital in northeastern Brazil seen between 1999 and 2013 were evaluated. Survival analysis was performed using the Kaplan-Meier method. The influence of age, sex, ethnicity, clinical stage, anatomical location, type of treatment, and comorbidities on the patients' prognosis was evaluated. Cox proportional hazards regression model was used to identify independent prognostic factors. RESULTS: The 5-year OS was 39%. Multivariate analysis showed that age < 40 years (HR = 2.20; 95%CI: 1.02-4.72) and a single treatment modality (HR = 1.91; 95%CI: 1.37-2.67) were associated with a poor prognosis, while early clinical stage resulted in better outcomes (HR = 0.38; 95%CI: 0.25-0.58). CONCLUSIONS: OSCC patients in advanced clinical stages, diagnosed at a younger age, and submitted to a single therapeutic modality have a poorer prognosis.

Histopathological grading systems and their relationship with clinical parameters in lower lip squamous cell carcinoma.

The objective of this study was to evaluate the histopathological grade of malignancy in a series of lower lip squamous cell carcinomas (LLSCCs) using three histopathological grading systems (invasive front grading system, World Health Organization (WHO) grading system, and histological risk assessment), and to correlate this with clinical parameters (tumour size/extent, regional lymph node metastasis, and clinical stage). Haematoxylin-eosin-stained histological sections obtained from 59 cases of LLSCC were analyzed by light microscopy. Grading of the invasive tumour front showed a significant association between low grade of malignancy and the absence of regional lymph node metastasis (P=0.030) and initial clinical stage (P=0.043). No significant associations were observed between the clinical parameters analyzed and the WHO system (P>0.05). Using the risk assessment, a highly significant association was observed between the risk score and regional lymph node metastasis (P=0.004) and clinical stage (P=0.002). In addition, the lymphocytic infiltrate was significantly associated with regional lymph node metastasis (P=0.017) and clinical stage (P=0.040). The results of the present study suggest that, among the histopathological grading systems evaluated, the histological risk assessment is the best option to predict the biological behaviour of LLSCCs.

Aggressive ameloblastic fibro-odontoma assessment with CBCT and treatment.

BACKGROUND: Ameloblastic fibro-odontomas (AFO) are rare lesions and defined by the World Health Organisation as a tumour composed of a proliferation of odontogenic epithelium immersed in ectomesenchyme reminiscent of the interdental papilla. It also presents inductive processes leading to formation of enamel and dentine, confusing, histopathologically, with odontoma. Despite numerous efforts, there is still considerable confusion over its controversial aetiopathogenesis and treatment. A brief review of the literature on the clinical, pathological and therapeutic features of this lesion is reported. CASE REPORT: A case of aggressive AFO in a 3-year-old boy was referred to the Oral Diagnostics Service of Hospital General de Fortaleza for evaluation following a 3-months painless swelling in the right mandibular and facial regions. During anamnesis, the patient's carers reported no systemic problem and his medical history was non-contributory. Intra-orally there was a swelling of the right lateral portion of the mandible, adjacent teeth were not mobile and the oral mucosa appeared normal and showed no signs of ulceration. Radiographic examination, with panoramic radiography and cone beam computed tomography with three-dimensional (3D) reconstruction, was better able to identify the extent of bone involvement and showed an expansive hypodense image in the right mandibular region. 3D reconstruction showed expansion of buccal and lingual cortical bone and the preservation of basal bone. TREATMENT: Enucleation and curettage of the lesion were carried out and care was taken not to fracture the basal bone during the surgical procedure. Tissue specimens were sent for histopathologic analysis. Aspiration performed during surgery was negative for blood and other exudates. FOLLOW-UP: No recurrence has occurred during a follow-up period of 11 months. CONCLUSION: A comprehensive diagnosis including all clinical, radiographic and histopathologic features is necessary for the success of therapy, which varies from case to case, thus, improving the quality of life of patients with AFO.

Immunohistochemical evaluation of intermediate filament proteins in squamous papilloma and oral verrucous carcinoma.

OBJECTIVE: Cytokeratins (CKs) are the intermediate filament proteins of the epithelium cells, which have become important markers of normal and abnormal cell differentiation. The goal of the present study was to investigate the expression pattern of CK 10, 13, 14 and 16 in oral verrucous carcinoma (OVC) and oral squamous papilloma (OSP). MATERIAL AND METHODS: Formalin-fixed paraffin-embedded sections from eight cases of each lesion were assessed. Immunohistochemistry was carried out using streptoavidin-biotin complex method. RESULTS: In OVC, CK 10 was expressed in suprabasal to superficial layers whereas in OSP mainly in superficial layer. CK 13 was detected in prickle and superficial cells in most cases of OVC and in suprabasal to superficial cells of OSP. All the cell layers of OVC reacted positively for CK 14 while basal and suprabasal layers of OSP were more pronounced for CK 14. Finally, CK 16 was observed in suprabasal to superficial layer in OVC and the majority cases in OSP showed only superficial reactive cells. CONCLUSIONS: CK 10, 13, 14 and 16 immunohistochemical profile emphasis the biological behavior of the studied lesions and confirm the use of these proteins as markers of differentiation.

Immunohistochemical assessment of extracellular matrix components in syndrome and non-syndrome odontogenic keratocysts.

OBJECTIVE: Investigate the immunohistochemical distribution of fibronectin, tenascin, laminin and collagen IV in syndrome (SOKC) and non-syndrome odontogenic keratocysts (NSOKC). MATERIALS AND METHODS: Ten cases of SOKC and five of NSOKC were selected and streptoavidin-biotin technique was applied. The specimens were analyzed taking into account the following evaluation parameters: presence, continuity and thickness in the basement membrane and intensity, distribution and association with inflammatory cells in the cyst wall. RESULTS: Differences could be detected regarding tenascin, fibronectin and collagen IV between the SOKC and NSOKC. Tenascin was present in all cases along the basement membrane in SOKC and in five cases of NSOKC predominated negative areas. Furthermore, tenascin distribution was focal in the cyst wall in SOKC whereas in NSOKC it was diffuse. Concerning fibronectin, it was detected as a discontinuous band when present in SOCK and as a continuous band in NSOKC. Collagen IV was not present in the majority of the cases in SOKC. Negative areas for laminin predominated in the basement membrane in both groups. CONCLUSIONS: These findings show differences between the immunohistochemical expression of tenascin, fibronectin and collagen IV which might indicate a more aggressive biological behavior of SOKC as compared with NSOKC.