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  • Title: The correlation between the expression of p53 protein and DNA ploidy in patients with gastric cancer that has invaded the serosa.
    Author: Wang Z, Ikeguchi M, Maeta M, Kaibara N.
    Journal: Anticancer Res; 1997; 17(5A):3701-5. PubMed ID: 9413227.
    Abstract:
    To estimate the correlation between the expression of mutated p53 protein and the nuclear DNA ploidy of gastric cancer cells, as well as the influence of these factors on the prognosis of patients with advanced gastric cancer, we selected 161 patients with gastric cancer that had invaded the serosa and who were treated by potentially curative gastrectomy. The expression of p53 protein was detected in 95 (59%) patients and aneuploidy was detected in 70 (43.5%) patients. The percentage of tumors with DNA aneuploidy among the 95 tumors that were p53-positive was 51.6% and this percentage was significantly higher than that of tumors with DNA aneuploidy among the 66 tumors that were p53-negative (31.8%, P = 0.02). The percentage of cells in the G2M phase of the cell cycle was significantly higher in p53-positive tumors than that in p53-negative tumors (P = 0.024). The 161 patients were divided into four groups according to the expression of p53 protein and the DNA ploidy of their tumors. Patients with p53-positive tumors and DNA aneuploidy were allocated to group A (n = 49), patients with p53-positive tumors and DNA diploidy were allocated to group B (n = 46), patients with p53-negative tumors and DNA aneuploidy were allocated to group C (n = 21), and patients with p53-negative tumors and DNA diploidy were allocated to group D (n = 45). The 5-year survival rate of group D was 73.7% and it was significantly higher than that of group A (41.8%, P = 0.007). These observations indicate that mutated p53 protein might accelerate cell proliferation. Moreover, analysis of both p53 status and DNA ploidy of tumors seems to provide very important information for evaluation of the prognosis of patients with advanced gastric cancer.
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