摘要目的 探讨成年人系统性EB病毒阳性T/NK细胞淋巴组织增殖性疾病(ASEBV+ T/NK-LPD)的临床病理特征、免疫表型和EBV感染特征,以提高对其的认识及诊断水平.方法 经过HE染色观察并采用免疫组织化学、原位杂交及基因重排技术,结合临床资料,对20例ASEBV+ T/NK-LPD患者病理资料进行回顾性研究,并进行随访.结果 (1)男15例,女5例,中位年龄34岁;起病至确诊时间平均8.7个月;主要临床表现有发热(18/20)、肝脾大(18/20)、淋巴结肿大(17/20);17例随访中11例死亡,平均生存时间2.9个月.(2)组织病理学特点:淋巴结T区明显增宽至弥漫成片,淋巴滤泡不同程度地减少或消失.病变中细胞种类多样至相对单一,以中小淋巴细胞增多为主,大细胞散在其中.淋巴细胞多数异型性不明显,少数轻或中度异型.6例被膜增厚,9例可见局灶或片状坏死及核碎;3例可见噬血细胞现象;另外,肝、脾、肠黏膜、扁桃体和骨髓主要表现为轻至中度异型淋巴细胞浸润.(3)免疫表型特点:20例都表现出T细胞明显多于B细胞,很多细胞表达颗粒酶B或T细胞胞质内抗原(TIA)-1,仅1例CD56阳性.14例CD4/CD8检测病例中8例以CD8阳性细胞为主,5例以CD4阳性细胞为主,1例CD8和CD4阳性数量相当.(4)全部病例EBER均阳性.阳性细胞最多的区域数量在30～300个/HPF,绝大多数病例中EBER阳性细胞包括大、中、小淋巴细胞,主要分布在扩大的T区.(5)TCR基因重排显示该病细胞群体中既有多克隆(4/7)也有单克隆(3/7).结论 ASEBV+T/NK-LPD呈亚急性或慢性经过,主要表现为反复发热伴淋巴结及肝脾大;淋巴结以T区扩大和轻中度异型淋巴细胞浸润为主;EBV感染的细胞毒性T细胞构成病变主体.它是一种危及生命的疾病,患者往往死于器官衰竭和出血.

abstractsObjective To study the clinicopathologic features, immunophenotype, clonality and Epstein-Barr virus (EBV) status of systemic EBV-positive T/NK-cell lymphoproliferative disease in adults (ASEBV + T/NK-LPD). Methods Twenty cases of ASEBV + T/NK-LPD were analyzed retrospectively with histopathologic review, immunohistochemistry and in-situ hybridization for EBV-encoded RNA (EBER).The follow-up data were collected. Results There were altogether 15 males and 5 females. The median age of the patients was 34 years. The average duration from onset of symptoms to diagnosis was 8. 7 months.Fever (18/20), hepatosplenomegaly (18/20) and lymphadenopathy (17/20) were the main clinical manifestations. Eleven of the 17 patients died during follow-up, with a mean survival of 2. 9 months.Histologically, there was obvious expansion of T zone of the involved lymph nodes, associated with diminished lymphoid follicles. The interfollicular areas were widened and infiltrated by small to median-sized lymphoid cells which showed only mild atypia. Scattered large lymphoid cells were not uncommon. The nodal capsule was thickened in 6 cases. Focal necrosis was seen in 9 cases. Sinus histiocytic proliferation with erythrophagocytosis was observed in 3 cases. In addition, there were mild atypical lymphoid cells infiltrate into the liver, spleen, intestinal mucosa and bone marrow. Immunohistochemical study and in-situ hybridization showed that the EBER-positive cells were of T-cell lineage, with CD3 expression. They were also positive for cytotoxic molecules (granzyme B or TIA-I) . Only 1 case was CD56 positive. A predominance of CD8-positive cells was demonstrated in 8 of the 14 cases studied, while CD4-positive cells predominated in the remaining 5 cases. One case showed similar proportion of CD8 and CD4-positive cells.The number of EBER-positive cells ranged from 30 to more than 300 per high-power fields. These EBERpositive cells were of small to large size and located mainly in the expanded T zone and occasionally in the germinal centers. Three of the 7 cases exhibited clonal rearrangement of T-cell receptor gamma gene, while the other 4 cases exhibited polyclonal rearrangement of T-cell receptor gamma gene. Conclusions ASEBV +T/NK-LPD is a systemic disease with a subacute or chronic clinical course. Most patients suffer from relapsing fever, lymphadenopathy and hepatosplenomegaly. The disease is characterized by proliferation of EBV-infected cytotoxic T cells. The T zone of the involved lymph nodes shows expansion by mildly atypical lymphoid cells. The disease is associated with poor clinical outcome and can be life-threatening. The patients often die of multiorgan failure and bleeding.