摘要目的 探讨乳腺癌新辅助化疗前核芯针穿刺活检(CNB)标本和化疗后手术切除标本的病理类型、病理分级、分子标志物表达及其改变与治疗反应病理评价的关系.方法 收集209例接受新辅助化疗的乳腺癌患者CNB和手术切除标本,评价其病理类型、病理分级、治疗反应病理评价信息(MP分级系统);应用免疫组织化学方法 (MaxVision二步法)检测上述标本分子标志物雌激素受体(ER)、孕激素受体(PR)和HER2的表达信息,应用SPSS 15.0软件进行相关统计学分析.结果 (1)新辅助化疗后治疗反应病理评价分别为MP1级14例,MP2级35例,MP3级106例,MP4级36例,MP5级18例.(2)CNB标本的ER表达与治疗反应病理评价呈负相关(χ2=33.083,P=0.001);手术切除标本各类信息与治疗反应病理评价未见统计学相关性(P>0.05);(3)化疗后手术切除标本信息均可发生改变,病理类型、病理分级发生变化病例所占比例分别为6.8%(9/132)和34.9%(30/86);ER、PR、HER2表达发生改变的比例分别为42.4%(75/177)、55.4%(98/177)和26.6%(46/173),仅HER2表达改变的差异有统计学意义(P=0.049).上述信息改变与治疗反应病理评价无关(P>0.05).结论 CNB标本对预测肿瘤治疗反应的病理评价具有重要价值.化疗后肿瘤的信息均可发生改变,因此有必要在新辅助化疗后重复确认肿瘤组织的病理类型及病理分级,并应用免疫组织化学方法 重复检测化疗后手术切除标本的分子标志物表达.

abstractsObjective To investigate the relationship between the pathologic responses and histologic type, grade, the expression of ER, PR and HER2 and their changes in breast carcinoma before and after neoadjuvant chemotherapy (NAC). Methods Two-hundred and nine cases of breast cancer with NAC were analyzed and clinical, pathologic data were evaluated based on the Miller and Payne (MP) grading system. The expression of ER, PR and HER2 in the cancers before and after NAC were detected by immunohistochemistry (MaxVision method). SPSS 15.0 software was used to conduct statistical analysis. Results (1) Pathologic responses to the NAC were graded as MP1 (14 cases), MP2 (35 cases), MP3 (106 cases), MP4 (36 cases) and MP5 (18 cases); (2) The expression of ER in core needle biopsy had related negatively to the pathologic response (χ2=33.083, P=0.001). However, the histologic type, grade, ER and PR status, and HER2 expression in surgically-removed specimens had not related to the pathologic response (P>0.05); (3) After NAC, the pathologic type and grade changed in 6.8% (9/132) and 34.9% (30/86) of the cases, and the rates of changes in the expression of ER, PR and HER2 were 42.4% (75/177), 55.4% (98/177) and 26.6% (46/173), respectively. Only the expression of HER2 had significant difference between before and after neoadjuvant chemotherapy (P=0.049). The changes in other data had no relationship with the pathologic response (P>0.05). Conclusions Analysis of core needle biopsy can provide important information to predict the pathologic responses to the NAC. The pathologic appearance, grade, ER, PR and HER2 in breast carcinoma may change after NAC. It is necessary to examine the histologic type, grade and the expression of ER, PR and HER2 after NAC once more.