[Epidemiological study, pathologic evaluation and prognostic factors of colorectal mucinous adenocarcinoma VS non mucinous [about a series of 196 patients]]

Colorectal carcinoma is one of the main causes of cancer death in the worldwide with a decrease survival rate in relationship with a later diagnosis of advanced disease. This study highlights the particular epidemiological, clinicopathological and immunohistochemical colorectal cancer profile. Indeed, our results differ markedly from that reported in the literature. We underwent a retro and prospective study interesting 196 patients with colorectal carcinoma diagnosed in the pathological and cytological laboratory of Mongi Slim Hospital [Tunisia]. Age at diagnosis, mode of presentation, sex, tumour location, macroscopic and histological features, TNM and Astler Coller stage were assessed and evaluated. we report here a particular epidemiological pattern which is characterised by younger age of the patients, equally distribution between men and women, predominant sporadic carcinomas and preponderance of rectosigmoid location. The poorer degree of differentiation and mucinous subtype are correlated with an advanced stage. It is also correlated with more frequent vascular embols, neural invasion and metastatic nodes. Furthermore, immunohistochemical analysis of galectin-3 showed a significant difference between mucinous and non mucinous adenocarcinoma. Based on the presented data, the epidemiological pattern and the anatomic distribution especially in the rectosigmoid region suggest diet and lifestyle to be primordial risk factors of colorectal tumorigenesis

[Pulmonary lymphangiomatosis revealed by an interstitial syndrome in a young adult]

The p73 gene encodes a nuclear protein that is highy homologous to p53. p73 also shares some common functions with p53 protein indicating that p73 gene is a p53-like tumor suppressor. In this study, we examined by immunohistochemistry the p73 expression on 120 cases of colorectal carcinomas and evaluated its implication in carcinogenesis. Retrospective study. The results show an increase of intensity and distribution of p73 in common adenocarcinoma from the normal mucosa, to primary tumors and to metastases. However, in mucinous adenocarcinomas, immunostaining of p73 decrease in primary tumor and completely diseappears in isolated cells and metastases compared with matched normal mucosa. These observations are further reinforced by the fact that in adenocarcinoma with mucinous component less than 50%, the positivity of p73 persist in well-differentiated areas and dramatically decreases or completely deseappears in mucinous areas. In conclusion, p73 would be a prognosic marker for the common adenocarcinomas and an ethiopathogenic factor for the mucinous subtype