免疫组化MYB和Notch1在乳腺腺样囊性癌中的应用

Application of immunohistochemistry MYB and Notch1 in adenoid cystic carcinoma of the breast

目的 探讨MYB、Notch1免疫组化染色在经典型乳腺腺样囊性癌(classic adenoid cystic carcinoma of the breast, C-AdCC)、具有基底细胞样特征的实体型乳腺腺样囊性癌(solid-basaloid adenoid cystic carcinoma of the breast, SB-AdCC)鉴别诊断中的应用价值。方法 收集病理科存档的20例C-AdCC、6例SB-AdCC及65例其他乳腺病变组织,分别行MYB、Notch1免疫组化染色,并对26例AdCC行FISH检测,6例SB-AdCC行NGS检测。结果 (1)MYB免疫组化染色显示:C-AdCC(20/20)弥漫中等或强阳性,SB-AdCC(4/6)弥漫中等或强阳性;胶原小体病(5/5)局灶或弥漫弱阳性;恶性腺肌上皮瘤(3/3)局灶中等或强阳性;8例产基质的癌、9例分泌性癌及40例非特殊型三阴型乳腺癌均阴性。(2)Notch1免疫组化显示:SB-AdCC(3/6)弥漫中等阳性,C-AdCC(20/20)均阴性;3例恶性腺肌上皮瘤、5例胶原小体病、8例产基质的癌、9例分泌性癌及40例非特殊型三阴型乳腺癌均阴性。(3)FISH检测显示C-AdCC(12/19)MYB基因断裂,NGS检测显示SB-AdCC(3/6)Notch1突变。结论 免疫组化MYB、Notch1中等或强的弥漫性表达,可辅助鉴别C-AdCC、SB-AdCC的分型;与恶性腺肌上皮瘤鉴别困难时,可借助分子检测进一步明确。

Purpose To investigate the value of MYB and Notch1 immunohistochemical staining in the differential diagno-sis of classic adenoid cystic carcinoma of the breast(C-AdCC)and solid-basaloid adenoid cystic carcinoma of the breast(SB-AdCC).Methods MYB and Notch1 immunohistochemical staining were performed in 20 cases of C-AdCC,6 cases of SB-AdCC and 65 cases of other breast lesions in the archives of pathology department.26 cases of AdCC were detected by FISH,and 6 cases of SB-AdCC were detected by NGS.Results MYB immunohistochemical staining showed that C-AdCC(20/20)was moderately or strongly positive,while SB-AdCC(4/6)was moderately or strongly positive.Collagenous spherulosis(5/5)showed focal or diffuse weak positivity;Malignant adenomyoepithelioma(3/3)was focally moderately or strongly positive;8 matrix-producing carcinomas and 9 secretory carcinomas and 40 non-specific triple-negative breast cancers were negative.Immunohistochemistry of Notch1 showed diffuse moderate positive for SB-AdCC(3/6)and negative for C-AdCC(20/20).3 cases of malignant adenomyoepithelioma,5 cases of collagenous spherulosis,8 cases of matrix-producing carcinoma,9 cases of secretory carcinoma and 40 cases of non-specific triple-negative breast cancer were negative.FISH showed MYB gene disruption in C-AdCC(12/19)and NGS showed SB-AdCC(3/6)Notch1 mutation.Conclusion Moderately or strongly diffuse expression of MYB and Notch1 by immunohistochemistry can assist in the differentiation of C-AdCC from SB-AdCC,and it can be further clarified by molecular detection when it is difficult to distinguish malignant adenomyoepithelioma.