Objective To investigate ING2 expression in normal gastric tissue,gastric carcinoma and precancerous lesions, and to explore correlation between ING2 expression and the carcinogenesis and progression of gastric carcinoma and the clinicopathological signficance as well as the correlation between ING2 and raP53 protein. Methods The expression of ING2 was measured by PV9000 two-step immunohistochemical staining. In total, 188 gastric cancer(GC), 128 matched normal gastric mucosa,35 chronic atrophic gastritis (CAG), 87 intestinal metaplasia (IM) and 36 dysplasia (DYS) samples were analyzed. Expression of mP53 was measured in 40 samples from the 188 gastric carcinomas mentioned above. Results Positive ING2 expression was significantly more frequent in CAG (74.29%) ,IM (91.95%) ,DYS (75.0%) and GCs (70.21%) than in normal gastric mucosa (36.72% ,P ＜0.05). Among GCs, ING2 expression varied by Lanren's classification. A significantly higher rate of positive ING2 expression was observed in intestinal type GCs (80. 56%) than in diffuse (64.49%) and mixed (55.56%, P ＜ 0.05) type GCs. Furthermore, positive ING2 expression was significantly more frequent in well-to-moderately differentiated adenocarcinoma(80. 60%) than in poorly differentiated adenocarcinoma (62. 62%, P ＜ 0. 05). No correlation was found between ING2 expression and mP53 expression in GC (P ＞ 0. 05). Over-expression and mislocalization of ING2 may be involved in the development of CC, especially intestinal-type GC. Further investigations are needed to explore the relevant molecular mechanism.%目的 检测生长抑制因子2(ING2)蛋白在正常胃组织、胃癌及其癌前病变组织中的表达,分析ING2与突变型P53(mP53)在胃癌中表达的关系,并探讨ING2与胃癌发生发展的关系及临床病理学意义.方法 免疫组织化学PV9000二步法检测188例胃癌及128例配对正常胃黏膜、35例慢性萎缩性胃炎、87例肠上皮化生及36例异型增生组织中ING2的表达.取其中的40例胃癌组织同时检测mP53蛋白的表达.结果 ING2蛋白在慢性萎缩性胃炎(74.29%)、肠上皮化生(91.95%)、异型增生(75.00%)和胃癌组织(70.21%)中阳性率均显著高于正常胃黏膜(36.72%),P＜0.001.ING2蛋白在胃癌中的表达与Lauren分型有关,在肠型胃癌中的表达率(80.56%)显著高于弥漫型(64.49%)和混合型胃癌(55.56%),P＜0.05,而且ING2蛋白在高-中分化管状腺癌的表达率(80.60%)显著高于低分化管状腺癌的阳性表达率(62.62%),P＜0.05.胃癌组织中ING2与mP53蛋白表达无相关性,P＞0.05.结论 ING2蛋白的过表达及细胞定位的改变可能参与胃癌的发生和分化,尤其是肠型胃癌的发生.
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