We examined the association of one linked GC/AT polymorphism at p73 with the risk of colorectal cancer. In the present study, we investigated whether this polymorphism was related to the risk of colorectal cancer, and whether there were relationships between the polymorphism and LOH, protein expression or clinicopathological variables. The p73 genotypes were determined by PCR-restriction fragment length polymorphism in 150 Tunisians patients with colorectal cancer and in 204 healthy control subjects. Immunohistochemistry was performed on normal mucosa, primary tumour and metastasis. The frequencies of the genotypes were 52% for wild-type (GC/GC), 31% for heterozygotes (GC/AT) and 17% for variants (AT/AT) in patients, and 54%, 35% and 11% in controls, respectively. There were no significant differences of the frequencies of the three genotypes between the patients and controls (p = 0.11). We did not find any relationship of the genotypes with clinicopathological features of patients. We found that patients with the AT/AT genotype had a significantly worse clinical outcome than those with the GC/AT and GC/GC genotype. There were no significant differences between tumoural immunostaining of the total p73 and p73 polymorphism (p = 0.16). However, we found a significant difference between the expression profile of DeltaNp73 isoform and frequencies of the three genotypes (p = 0.0001). No LOH was observed at p73 locus. Our results suggest that the AT/AT genotype is significantly associated with poor prognosis in colorectal cancer. All these findings suggest that p73 polymorphism analysis may provide useful prognostic information for colorectal cancer patients.

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of the breast: distinct pathological lesion mimicking a carcinoma. Our Dermatol Online. 2016;7(4):400-402.

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All these findings prove that p73 expression should be considered as a valuable poor prognostic marker. Our data also suggest that TP73 gene may play a role in colorectal carcinoma development.

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