Desmoid fibromatosis of the breast:clinicopathological analysis of twenty-six cases and review of literatures
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维普
目的 探讨乳腺韧带样纤维瘤病(desmoid fibromatosis of the breast,DFB)的临床病理学特征、诊断、鉴别诊断和分子遗传学特征.方法 收集26例DFB患者的临床病理资料及预后信息,分析其临床特点、组织学、免疫表型和分子学特征.结果 26例患者均为女性,年龄范围13～69岁,平均36.8岁,中位年龄34.5岁.发生于左侧乳腺10例,右侧乳腺14例,双侧乳腺2例,临床均以发现乳腺孤立无痛性肿块就诊,3例伴有乳头凹陷.大体见肿物界限不清,质韧-硬,镜下见肿物由增生的梭形细胞和多少不等的胶原纤维组成,与周围乳腺组织界限不清,呈指突样浸润乳腺导管和小叶.肿瘤细胞呈梭形或卵圆形,排列呈束状、编织状,形态温和,无明显多形性、不典型性,细胞核染色质稀疏或呈空泡状,可见小核仁,核分裂象罕见.免疫表型:肿瘤细胞3-catenin核阳性(20/26),SMA不同程度阳性(20/26),desmin局灶阳性(6/26),CKpan、CK5/6、p63、CD34、CD10、S-100均阴性,Ki67增殖指数5％～10％.Sanger测序检测到CTNNB1基因第3外显子突变(18/26),其中15例为T41A位点突变(83.3％),2例为S45P位点突变(11.1％),1例S45F位点突变(5.6％).其中2例患者同时患有家族性腺瘤性息肉病.23例行局部肿块切除,2例行乳腺单纯切除,1例粗针穿刺诊断后未治疗.20例患者获得随访,随访时间为1～108个月,均未复发.结论 DFB罕见,易误诊为恶性,应与多种发生于乳腺的梭形细胞增生性病变鉴别,需结合组织学、免疫表型及基因检测等明确诊断.
Purpose To investigate the clinicopathological features,diagnosis,differential diagnosis and molecular charac-teristics desmoid fibromatosis the breast(DFB).Methods The clinicopathological data and prognostic information of 26 pa-tients with desmoid fibromatosis of the breast were collected.Their clinical characteristics,histological morphologies,immu-nophenotypes and molecular characteristics were analyzed.Re-sults All the 26 patients were female,with a median age of 34.5 years and an average age of 36.8 years(range from 13 to 69 years).There were 10 cases in left breast,14 cases in right breast and 2 cases in bilateral breast.Isolated and painless breast masses were found in all patients,and 3 cases were ac-companied by nipple depression.Grossly,most of them showed a poorly circumscribed tan-white to gray mass with a trabeculated appearance.Microscopically,all the tumors were composed of mild spindle cells with varying intervals of collagen fiber bun-dles.The boundary between the tumor and the surrounding breast tissue was not clear,and the tumor cells infiltrated adja-cent tissues,such as breast ducts,lobules,adipose tissue,and skeletal muscle.Uniform spindle or oval cells formed in fascicles and interwoven,without atypical or polymorphism;the nuclear chromatin was sparse or vacuolar,with small nucleoli,but mito-ses were rare or absent.Nuclear accumulation of β-catenin was present in 20 of 26 tumors,SMA was variously positive in 20 of 26,desmin was focally positive in 6 of 26;CKpan,CK5/6,p63,CD34,CD10 and S-100 were all negative.The Ki67 index was 5％-10％.The gene mutations of CTNNB1 exon 3 were found in 18 of 26 by Sanger sequencing,including T41A(83.3％),S45P(11.1％)and S45F(5.6％).Two patients also had familial adenomatous polyposis.Local resection was performed in 23 cases,mastectomy was performed in 2 cases,and one case did not require any additional treatment after core needle biopsy.20 cases were followed up for 1-108 months,and no recurrence occurred.Conclusion Desmoid fibromatosis of the breast is rare,and can mimic breast cancer clinically,ra-diologically and histologically.It should be always considered in differential diagnosis for the spindle cell proliferations of the breast.A diagnosis of DFB can be achieved basing on the typi-cal histopathology,immunohistochemistry,history and gene se-quencing.
breast neoplasmdesmoid fibromatosisdiagnosisdifferential diagnosisimmunohistochemistry
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