摘要
背景与目的:多数胃癌新辅助化疗的临床试验结果是肯定的,而微卫星不稳定性(microsatelliteinstability,MSI)已被认为是细胞癌变的新机理。本文拟探讨新辅助化疗对胃癌MSI的影响。方法:选取D2S123、D3S1298两个微卫星位点,从48例已行氟尿嘧啶/醛氢叶酸(5-FU/CF)术前化疗胃癌患者的石蜡标本中提取DNA,经PCR扩增、变性聚丙烯酰胺凝胶电泳、银盐染色,采用自身对照的方法,比较化疗前后胃癌组织MSI的表现;采用!2检验分析新辅助化疗对胃癌MSI的影响。结果:术前标本两个位点共检出MSI阳性15例,检出率31.3%。术后标本检出MSI阳性6例,检出率为12.5%。共有9例样本由化疗前的MSI阳性变为MSI阴性,无MSI阴性转为MSI阳性的病例。经!2检验,化疗前后的MSI阳性率有显著性差异(31.3%vs.12.5%,P=0.026)。结论:5-FU/CF新辅助化疗方案对胃癌MSI有影响。新辅助化疗后,部分MSI阳性的病例可以表现为阴性,但对MSI阴性病例无影响。
BACKGROUND & OBJECTIVE: Most results from clinical trials of neoadjuvant chemotherapy for gastric carcinoma are certain. Meanwhile, microsatellite instability (MSI) is thought to be a new mechanism of cell canceration. This study was to investigate the influence of neoadjuvant chemotherapy on MSI in gastric carcinoma. METHODS: Two microsatellite loci D2S123 and D3S1298 in tumor samples from 48 patients with gastric carcinoma, received preoperative chemotherapy of 5-fluorouracil (5-FU) and leucovorin (CF), were analyzed by polymerase chain reaction (PCR), electrophoresis on 8% denatured polyacrylamide gel, and silver staining. The microsatellite statuses of preoperative and postoperative specimens were compared. Chi-square test was used to analyze the influence of neoadjuvant chemotherapy on MSI in gastric carcinoma. RESULTS: The detection rate of MSI was significantly higher in preoperative samples than in postoperative samples (31.3% vs. 12.5%, P=0.026). After neoadjuvant chemotherapy, 9 cases changed from MSI-positive to MSI-negative, while no MSI-negative cases became MSI-positive. CONCLUSION: The neoadjuvant chemotherapy regimen of 5-FU/CF can induce some MSI-positive gastric carcinoma change to MSI- negative, but has no effect on MSI-negative cases.
出处
《癌症》
SCIE
CAS
CSCD
北大核心
2006年第12期1493-1496,共4页
Chinese Journal of Cancer
关键词
胃肿瘤/药物疗法
胃肿瘤/外科手术
DNA
微卫星不稳定性
Gastric neoptasm/chemotherapy
Gastric neoplasm/surgical operation
DNA
Microsatellite instability