Tumor Marker and Carcinogenesis

Cancer may be regarded as a group of diseases characterized by an (i) abnormal growth of cells (ii) ability to invade adjacent tissue and even distant organs and(iii) the eventual death of the affected patient if the tumor has progressed beyond that stage when it can be successfully removed . Cancer can occur at any site or tissue of the body and may involve any type of cells.In 1995 the south East Asia Region of WHO found that there is great majority of cancers of the oral cavity in India . These and other international variations in the pattern of oral cancer are attributed to multiple factors such as environmental factors , food habits , life style , genetic factor or even inadequacy in detection and reporting of cases. Oral cancers are also predominantly environment related and have socio –cultural relationship31. Majority of malignancies arising in oral mucosa are epithelial in origin approximately 90% of being squamous cell carcinomas .Management of oral carcinoma includes early diagnosis , accurate assessment of prognosis and proper therapeutic intervention. Tumormarkers play an important role in all the aspect of management of oral cancer. Tumor markers are a group of proteins(oncoprotein, immunoglobulin, albumin, globulin),hormones(adrenal corticotropic hormone (ACTH), calcitonin, catecholamines), enzymes(acid phosphatase, alkaline phosphatase, amylase, creatine kinase) ,receptors(estrogen receptor, progesterone receptor, interleukin-2 receptor, and epidermal growth factor receptor), and other cellular products that are over expressed (produced in higher than normal amounts) by malignant cells48. Tumor markers are usually normal cellular constituents that are present at normal or very low levels in the blood of healthy persons and the Carcinogenesis (meaning literally, the creation of cancer) is the process by which normal cells are transformed in to cancer cells. Carcinogenesis is a multistep process resulting from the sequential perturbation of both posit