喉鳞癌组织中FHIT表达与细胞增殖、转移的关系

Correlation of FHIT Expression to Cell Proliferation and Metastasis of Laryngeal Squamous Cell Carcinoma

背景与目的:脆性组氨酸三联体(fragilehistidinetriad,FHIT)基因定位于染色体3pl4.2,跨越大多数人类基因组的共同脆性部位FRA3B,为一候选的抑癌基因,在包括头颈部鳞状细胞癌在内的许多人类恶性肿瘤中都存在FHIT基因的异常。本研究的目的为探讨喉鳞癌(laryngealsquamouscellcarcinoma,LSCC)组织中FHIT基因蛋白的表达及其与肿瘤细胞增殖与转移的关系。方法:采用免疫组化S法,检测41例喉鳞癌组织及其相对应的喉切缘非癌组织中FHIT、PCNA的表达。结果:非癌组织和喉鳞癌组织中,FHIT阳性率分别为100%(41/41)和46.3%(1941)(P<0.01)。喉鳞癌中,在TNM分期Ⅰ～Ⅱ期和Ⅲ～Ⅳ期组,FHIT阳性率分别为69.6%和16.7%;淋巴结转移阳性和阴性组分别为20.0%和61.5%。以上两组比较均有显著性差异(P<0.05)。非癌和喉鳞癌组织中,PCNA标记指数分别为(9.98±2.34)%和(50.71±13.64)%,两者有极显著性差异(P<0.01)。喉鳞癌中,FHIT与PCNA表达有明显的负相关关系(P<0.05)。结论:FHIT低表达与喉鳞癌细胞增殖及淋巴结转移有关。

BACKGROUND &OBJECTIVE: Fragile histidine triad (FHIT) gene, a candidate tumor suppressor gene, located at 3pl4.2, spans the most common fragile site, FRA3B, in human genomes. It is altered in many human cancers, such as head and neck squamous cell carcinoma. This study was to investigate correlation of FHIT expression to cell proliferation and metastasis of laryngeal squamous cell carcinoma (LSCC). METHODS: Expression of FHIT protein, and proliferating cell nuclear antigen (PCNA) was detected by SP immunohistochemistry in 41 specimens of LSCC and their matched adjacent non cancerous epithelium (NCE). RESULTS: Positive rates of FHIT in NCE, and LSCC were 100.0%(41/41), and 46.3%(19/41) (P< 0.01); in LSCC of stage Ⅰ-Ⅱ, and stage Ⅲ-Ⅳwere 69.6%(16/23), and 16.7%(3/18) (P< 0.01); in lymph node metastasis group, and no metastasis group were 20.0%(3/15), and 61.5%(16/26) (P< 0.05). PCNA labeling indexes in NCE, and LSCC were (9.98±2.34)%, and (50.71±13.64)%(P< 0.01). In LSCC, expression of FHIT negatively correlated with PCNA (P< 0.05). CONCLUSION: Low expression of FHIT might play an important role in cell proliferation and metastasis of LSCC, FHIT might be a useful marker for evaluating biological behaviors of LSCC.