腹腔上皮样炎性肌纤维母细胞肉瘤2例临床病理观察  

Clinicopathologic characteristics of intra-abdominal EIMS and review of the literature

作　　者：彭全洲[1,2] 陈灼怀[1,2] 王晓玫[1,2] 左敏[1,2] 刘汉勇[1,2] 胡锦涛[1,2] 成志强[1,2] 

机构地区：[1]暨南大学第二附属医院 [2]深圳市人民医院病理科,518020

出　　处：《临床与实验病理学杂志》2015年第5期547-551,共5页Chinese Journal of Clinical and Experimental Pathology

摘　　要：目的探讨腹腔上皮样炎性肌纤维母细胞肉瘤(epithelioid inflammatory myofibroblastic sarcoma,EIMS)的临床病理学特征、诊断和鉴别诊断、分子遗传学进展、治疗及预后。方法回顾性分析2例EIMS的临床表现、大体及组织学形态、免疫表型,并复习相关文献。结果例1,男性,15岁;例2,女性,21岁,均因腹部疼痛不适入院,入院后行肿物切除术。肿瘤由致密区和富于黏液的疏松区构成,肿瘤细胞圆形、上皮样,核圆,核仁明显,可见病理性核分裂及瘤巨细胞,伴肿瘤性坏死,背景中可见丰富的炎细胞,以中性粒细胞为主体伴少量淋巴细胞和浆细胞。免疫表型:肿瘤细胞表达ALK、vimentin、desmin和CK(AE1/AE3)(灶阳性),不表达Calretinin、CD30、CD31、CD33、SMA、HHF35、Myogenin、S-100、HMB-45、CD20、CD79a、CD3、CD5、CD45和CD68。FISH检测显示2例均有ALK基因相关易位。结论腹腔EIMS罕见,作为炎性肌纤维母细胞肿瘤的独立亚型之一,其正确诊断尤为重要。ALK抑制剂或使ALK阳性的EIMS患者获益。Purpose To explore the clinicopathologic characteristics, immunophenotype, diagnosis and differential diagnosis, molecu-lar genetic feature, treatments and prognosis of intra-abdominal EIMS. Methods Two cases of intra-abdominal EIMS were studied with clinical manifestations, histology and immunohistochemical staining, and its clinical and pathological findings were further ana-lyzed with review of the literature. Results Case 1 was a 15-year-olds male and case 2 was a 21-year-olds female both of whom pres-ented with abdominal pain. Two patients were treated by surgical excision. Microscopically the tumor consisted of two different histolog-ical types, one of which was of high cell density and the other with low cell density and myxoid stroma. Both of these areas contained inflammatory cells, mainly neutrophils with few lymphocytes and plasmocytes. Tumor cells had an epithelioid phenotype with round nu-clei and small nucleoli, various nuclear atypia and mitotic figures were also found, which consistented with the diagnosis of epithelioid inflammatory myofibroblastic sarcoma. Immunohistochemical analysis revealed that the tumor cells were positive for ALK, vimentin, desmin, and CK（AE1/AE3） （focal）, and were negative for Calretinin, CD30, CD31, CD33, SMA, HHF35, Myogenin, S-100, HMB-45, CD20, CD79a, CD3, CD5, CD45 and CD68. ALK rearrangement was identified in both cases by FISH using ALK break-a-part probe. Conclusions As an extremely rare tumor, the distinguishing between epithelioid inflammatory myofibroblastic sarcoma and conventional inflammatory myofibroblastic tumor is important. ALK inhibitors are theoretically useful for treating these tumors.

关 键 词：上皮样炎性肌纤维母细胞肉瘤 炎性肌纤维母细胞肿瘤 ALK 诊断 预后 

分 类 号：R730.26[医药卫生—肿瘤]