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Introduction: Pattern of invasion (POI) in scoring system of oral squamous cell carcinoma (OSCC) can predict local recurrence and overall survival rate. Argyrophilic nucleolar organizer region (AGNOR) counts are considered to reflect the biosynthetic and nucleolar activity of a cell and thus serve as an indicator of the rapidity of the cell cycle thereby indicating the proliferative index of the tumor. It is implied that higher tumor associated tissue eosinophilia (TATE) showed lesser venous invasion, lymph node metastasis and clinical recurrence. The aim of the study was to assess and evaluate the following criteria's: POI-1 to POI-4 as defined by Bryne et al. in OSCC, proliferative index by AgNOR stain and TATE with carbol chromotrope stain in OSCC, validity of POI by correlating the AgNOR proliferative index and TATE. Materials and Methods: Forty samples of formalin fixed paraffin embedded tissue blocks diagnosed of OSCC were taken for the study. Three sections were taken from a single block and then the tissues were stained differently with H & E Stain, AgNOR stain and Carbol chromotrope stain. First section stained with H & E was observed for POI and grading was done according to Bryne's criteria. The second and third sections were stained with AgNOR stain and Carbol chromotrope stain for proliferative index and TATE. One way analysis of variance was used to test the significance. Results: Mean AgNORs count increases gradually from type 1 to type 4, depicting the increase in the nucleolar proliferative index of the cells and was statistically significant. In the case of the mean eosinophilic count, type 1 shows the highest mean eosinophilic count and the count shows drastic decrease till type 3 and from type 3 to type 4 the decrease is more gradual and was statistically significant. Conclusion: The study validated that POI is a good predictor for prognosis and also can be included in grading OSCC along with routine histopathological criteria. [ABSTRACT FROM AUTHOR]

Background: Oral squamous cell carcinoma (OSCC) is a significant public health problem in India, accounting to 30% of all cancers with a worrying rise in incidence and related mortality. Invasive tumor front (ITF) of OSCC has been an area of histopathologic research interest, where parameters like tumor budding (TB), mode of invasion (MOI) and lymphocytic host response (LHR) are being evaluated extensively. Objectives: The aim is to study and evaluate the possible association of ITF histological parameters such as TB, LHR and MOI with known clinicopathological prognostic factors in cases of OSCC. Subjects and Methods: We reviewed and analyzed 69 cases of OSCC for routine clinicopathological parameters, TB, MOI and LHR for any significant correlation (P < 0.05 by Chi-square test) with each other and with outcome in cases where follow-up was available. Results: TB correlated significantly with histological grade, worst pattern of invasion (WPOI), Lymphnodal involvement (LNI), Lymphovascular invasion (LVI), Perineural invasion (PNI) and age; MOI correlated with WPOI, LNI, LVI and PNI; and LHR significantly correlated with WPOI, PNI, Tumor size (pT) and outcome. TB showed a strong correlation with MOI (P < 0.001) and LHR; and no significant association was noted between LHR and MOI. Among all the clinicopathological parameters, depth of invasion, pT, WPOI, PNI and LHR showed significant correlation with outcome. Conclusion: TB, MOI and LHR showed good correlation with established parameters and as they are easy and helps in prognostication, they should be included in routine histopathological reporting guidelines. [ABSTRACT FROM AUTHOR]

Background: Recent studies have indicated that although malignant cells at the invasive tumor front, bare morphological resemblance to the cells at central portion of the tumor, their molecular character differs significantly. E-cadherin is a cell-cell adhesion molecule that connects epithelial cells. This study attempts to correlate the E-cadherin expression at the invasive tumor front with tumor differentiation along with its clinico-pathological parameters. Materials and Methods: Immunohistochemical staining with E-cadherin was carried out on archival cases of primary oral squamous cell carcinomas (n = 30). The E-cadherin expression at the invasive tumor front was analyzed and was linked to clinico-pathological parameters including patient prognosis. Results: The downregulation of E-cadherin expression at the invasive tumor edge when compared with patient's prognosis yielded a significant correlation (P = 0.041) but its correlation with the degree of differentiation determined was not significant (P = 0.27). Also, its association with tumor size and lymph node status was negative. Conclusions: Loss of E-cadherin expression at the invasive tumor front is an important event in the progression of oral squamous cell carcinomas. Tumors with a loss of expression of E-cadherin are those which had a poor prognosis [ABSTRACT FROM AUTHOR]

Malignant tumor of oral cavity account for approximately 30% of all head and neck cancers and 95% of these are Oral Squamous Cell Carcinoma (OSCC). Patients with OSCC can die from failure to control the primary lesion or regional lymph node metastases. An analysis of the prognostic factors in addition to tumor, node, metastases (TNM) staging or the histopathological grading is important for predicting the prognosis and achieving a high-survival rate in these patients. The invasive tumorfront(ITF) has been defined as the most progressed, 3 to 6 tumor cell layers or detached tumor cell groups at the advancing edge of the OSCCs. The ITF frequently shows a lower degree of differentiation, migration, apoptosis and a higher grade of cellular dissociation in comparison with other parts of the tumor. The histological features of OSCC may widely differ from area to area within the same tumor and it is believed that the most useful prognostic information can be deduced from the invasive tumor front, where the deepest and presumably most aggressive cells reside. Numerous molecular events of significance for tumor spread, such as gain and loss of adhesion molecules, secretion of proteolytic enzymes, increased cell proliferation, budding and initiation of angiogenesis occur at the tumor-host interface or invasive front. This poster will discuss the significant pathologic changes occurring at the ITF and its importance in early detection and prognosis in OSCCs. [ABSTRACT FROM AUTHOR]