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Objective: Carcinoma of the rectal colon begins as a small neoplastic polyp which gradually increases in size and, after passing through various degrees of dysplasia, develops into an overtly malignant carcinoma. Clinical experience suggests that patients may be divided into subgroups based on the aggressivity of the tumour. The genetic mutations associated with colorectal cancer have been studied and it is known that the genes primarily responsible for biologica1 changes in the tumour cell, in the early stages, are APC, hMSH2, k-ras2 and, in particular, p53. Indeed, the mutation at the level of gene p53 has been recognized as the most common mutation in tumour cells. The aim of this study was investigate the role of p53 and CD34 in colorectal cancer.