伴有滤泡的非特殊型外周T细胞淋巴瘤的临床病理学研究

目的 探讨伴有滤泡的非特殊型外周T细胞淋巴瘤(简称伴滤泡的PTL-U)的临床病理学特点.方法 对18例伴滤泡的PTL-U和8例淋巴结反应性增生患者进行临床资料分析并对14例伴滤泡的PTL-U患者进行随访;应用目镜测微尺对这些患者的淋巴结石蜡包埋切片进行形态学半定量观测、免疫表型分析及分子生物学检测.结果 (1)伴滤泡的PTL-U患者中位年龄53岁(4～73岁),男:女=1.57:1.就诊时均以淋巴结肿大为主要表现,伴B症状(发热、盗汗、体重减轻)8例;(2)数量及大小不等、形态不一的滤泡增生;(3)T区扩大,有数量不等、中等大小、胞质透明的肿瘤细胞浸润,易见核分裂象,平均(59.83±14.39)个/mm2[显著高于对照组(15.50±12.32)个/mm2,P<0.05];(4)免疫组织化学示T区主要为弥漫性较单一的T细胞增生占绝对优势;(5)T区Ki-67阳性率均值为(38.24±13.42)%/mm2[(23.7%～63.0)%/mm2][显著高于对照组(17.67±8.84)%/mm2,P<0.05];(6)TCR基因重排检出率71.4%(10/14).结论 伴滤泡的PTL-U形态学特点具有相对的特征性,结合病理形态、免疫表型及临床表现,绝大部分病例是可以诊断的,少数不典型者采用PCR检测基因重排可进一步明确诊断,仍无法确诊者需要长期随访根据病情变化确诊.

Clinicopathologic features of peripheral T-cell lymphoma, unspecified with follicular pattern

Objective To study the clinicopathologic features of peripheral T-cell lymphoma, unspecified (PTL-U) with follicular pattern. Methods The clinical data, hematoxylin and eosin-stained sections of lymph node biopsies and follow-up data of 18 cases of PTL-U associated with follicular growth pattern were reviewed and studied. Eight cases of reactive lymphoid hyperplasia were used as controls. Semi- quantitative observation by retiform micrometer rule was carried out. Immunohistochemical study was also performed in all cases. T-cell receptor and immunoglobulin heavy chain gene rearrangement studies were conducted by polymerase chain reaction-based method. Results The median age of the patients was 53 years. The male-to-female ratio was 1.57:1 in lymphoma group. All of the lymphoma patients presented with superficial lymphadenopathy, with (8/18) or without B symptoms. Histologically, the lymphoma was characterized by follicles of various sizes and shapes. The T zones were expanded by medium-sized lymphoma ceils which contained clear cytoplasm and irregular nuclei. Mitotic figures were commonly identified. Immunohistochemical study confirmed that the lymphoma cells were of T-lineage. The proliferative index, as highlighted by Ki-67, was higher [average = (38.24±13.42) %/mm2] than that in the control group. T-cell receptor gene rearrangement was demonstrated in 71.4% (10/14) of the iymphoma cases. Conclusions A definitive diagnosis of PTL-U with follicular pattern can be made on the basis of morphologic examination, immunohistochemical assessment and clinical features. Cases with atypical features can further be delineated by molecular analysis. Long-term follow up of these patients is prudent.