乳腺囊内乳头状癌的临床病理学分析

目的 探讨乳腺囊内乳头状癌的临床病理特征及其鉴别诊断.方法 观察14例囊内乳头状癌的临床病理特点,并采用平滑肌肌动蛋白(SMA)、肌特异性肌动蛋白(MSA)、ER、PR、p63、广谱和高相对分子质量CK(AE1/AE3和34βE12)和CK5/6进行EnVision法染色.结果 14例发病年龄42～79岁,平均65.4岁.乳腺肿块是最常见的症状.镜下见两种形态,以较纤细的乳头状结构为主,乳头纤维血管轴心衬覆高柱状上皮细胞,无肌上皮细胞(9例)和以张力高的筛孔或实性结构为主,其问仍可见纤维血管轴心(5例);11例为单纯性囊内乳头状癌,1例伴有导管原位癌,2例伴有浸润性癌.肿瘤细胞核为低级别,肿瘤细胞呈ER和PR弥漫强阳性,CK5/6和34βE12阴性或局灶弱阳性.肿瘤内未见肌上皮细胞,而肿瘤外围肌上皮消失或仅散在着色.结论 囊内乳头状癌是一种发生在老年妇女的少见肿瘤,在临床表现、组织形态和免疫表型上的独特性有助于鉴别诊断.

Clinicopathologic study of intracystic papillary carcinoma of the breast

OBJECTIVE: To elucidate the clinicopathologic features, immunophenotype and differential diagnosis of intracystic papillary carcinoma (IPC). METHODS: The clinical and pathological characteristics of 14 cases of breast IPC were studied. Immunohistochemical study of SMA, MSA, ER, PR, p63, AE1/AE3, 34betaE12 and CK5/6 was performed using Envision method. RESULTS: The age of IPC patients ranged from 42 to 79, with a mean age of 65.4 years. A palpable mass was the most common symptom. There were two morphological features: (1) Slender papillae lined by tall columnar epithelial cells which were present directly on the fibrovascular cores without an intervening myoepithelial cell layer (9 cases). (2) The proliferation may assume a cribriform architecture with rigid, punched-out regular spaces or a solid glandular pattern, studded with fibrovascular cores (5 cases). Low nuclear grade is typically seen. Among the 14 cases of IPC, 11 were of pure type. Ductal carcinoma in situ (DCIS) in adjacent ducts was found in one case, and invasive carcinoma was found in two cases. Immunohistochemical results showed that the tumor cells were homogenously strongly positive for ER and PR, but were negative or focally and weakly positive for CK5/6 and 34betaE12. Myoepithelial cell staining was negative within the tumor; and was diminished or scattered at the periphery of the tumor. CONCLUSIONS: IPC is a rare entity that usually arises in older women. It is specific enough in its clinical presentation and morphologic appearance to warrant distinction from other breast lesions.