원발성 폐암에서 p53 의 발현과 S - Phase Fraction 및 예후와의 관계

Objectives: The p53 has been implicated in the control of cell cycle, DNA repair and programmed cell death especially, arrest of the cell cycle at G1 phase during DNA damage and repair. It is now widely accepted that mutations of p53 are among the most common changes that occur during malignant progression of diverse types of cancer. Based on this information, it seems reasonable to expect that there may be clinical prognostic significance of p53 changes in primary lung cancer. But its prognostic significance is controversial. Methods: To investigate the role of p53 mutation in lung cancer, we performed immunohistochemical stain of p53 on 57 resected primary non-small cell lung cancer specimens, thereafter, flow cytometric cell cycle analysis was done. And we analyzed the correlation between p53 expression, S-phase fraction and survival. Results: 1) p53 was detected in 70% of total 57 patients (according to histologic type, squamous carcinoma 74%, adenocarcinoma 69%, large Cell carcinoma 33%). p53 was positive in 71% of stage 1, 76% of stage 2, 63% of stage 3a, 67% of stage 3b (statistic insignificance). 2) Using the flow cytometric cell cycle analysis, mean S-phase fraction of p53(+) and (-) group are 21.3 (±7.4)%, 16.5 (±6.4)% (p