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Aberrant p53 Expression Correlates With Expression of Vascular Endothelial Growth Factor mRNA and Interleukin-8 mRNA and Neoangiogenesis in Non–Small-Cell Lung Cancer

From the Division of Chest Medicine, Department of Internal Medicine; Division of Chest Surgery, Department of Surgery; and Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, and Institute of Biomedical Sciences, Academia Sinica, Taiwan.

Address reprint requests to Pan-Chyr Yang, MD, PhD, National Taiwan University Hospital, No 7, Chung-Shan South Rd, Taipei 100, Taiwan; email: pcyang{at}ha.mc.ntu.edu.tw

PURPOSE: To evaluate interactions between expressions of tumor suppressor gene p53 and angiogenic factors vascular endothelial cell growth factor (VEGF) and interleukin-8 (IL-8) and their effect on tumor angiogenesis and patient prognosis in non–small-cell lung cancer (NSCLC).

PATIENTS AND METHODS: p53, VEGF, IL-8, and the microvessel endothelium were immunostained, and VEGF and IL-8 mRNA expression were quantified using the real-time quantitative reverse-transcription polymerase chain reaction in 65 NSCLC surgical specimens. Aberrant p53 expression was correlated with VEGF and IL-8 mRNA expression, microvessel count (MVC), other clinical-pathologic variables, and patients’ survival.

RESULTS: Tumors with high aberrant p53 expression showed significantly higher VEGF and IL-8 mRNA expression and MVC than those with low aberrant p53 expression (P < .001). When tested as a continuous variable, aberrant p53 expression correlated strongly and positively with VEGF and IL-8 mRNA expression and MVC (P < .0001). Tumors with high aberrant p53 expression were associated with mediastinal or distant lymph node metastasis (P = .006). Survival and postoperative relapse time were significantly shorter in patients with high aberrant p53 expression tumors than in those with low aberrant expression tumors (P < .0001). A significant difference in survival was also seen between patients with high and low tumoral VEGF mRNA expression and between those with high and low tumoral IL-8 mRNA expression (P < .0001).

CONCLUSION: We report here for the first time that aberrant p53 expression is strongly positively correlated with VEGF mRNA and IL-8 mRNA expression in NSCLC. This result indicates that aberrant p53 expression may play a significant role in regulation of VEGF and IL-8 expression and be involved in controlling angiogenesis and explains the adverse prognosis of cancers with high aberrant p53 expression.

Supported in part by grant no. NSC-89-2314-B-002-425 from the National Science Council of the Republic of China.

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