Abstract：
Objective: To investigate the clinical, pathological and immunophenotypic features, and differential diagnosis of angioimmunoblastic T-cell lymphoma (AITL) with B-cell proliferation or neoplasms. Methods: Eight qualified cases were collected from the Department of Pathology, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China from January 2019 to July 2023. One case was diagnosed with AITL and diffuse large B-cell lymphoma (DLBCL) and the other seven cases were diagnosed with AITL and B-cell proliferation. Clinical characteristics and pathological morphology were summarized. Immunohistochemical analysis, fluorescence in situ hybridization and gene rearrangement detection were performed. Results: The patients\' average age was 58 years. Five of them were male. Biopsies of the enlarged cervical lymph nodes showed structural destruction and exhibited various histologic patterns. Some cases revealed Burkitt-like morphology, a moderate tumor volume and slightly irregular nuclei. Some cases showed prominent nucleoli. High endothelial venules and expanded follicular dendritic cells were detected. Tumor cells derived from T-follicular helper (TFH) cells were positive for two or more TFH biomarkers. Nodular or diffuse patchy proliferation of B cells was noted around the tumor tissue, which was initially considered as B-cell lymphoma. All of the 8 cases showed monoclonal rearrangements of the T-cell receptor genes while 5 of them also showed clonal rearrangements of the Ig genes. Seven of the 8 cases were subject to the detection of C-MYC gene breakage and were all negative. EBV-positive cells were seen in 6 cases. Neoplastic B cells were positive for C-MYC (>40%), while proliferative B cells were negative for C-MYC (<40%). Conclusions: The histological morphology of AITL with B-cell proliferation or lymphoma may be different from AITL. An integrated analysis, incorporating clinical, morphologic, immunophenotypic, and molecular assessment, helps reach an accurate diagnosis. This group of cases demonstrated the clinical and pathological characteristics of AITL accompanied by B-cell proliferation and B-cell lymphoma. The findings suggest that C-MYC maybe a feasible indicator for distinguishing B-cell proliferation from B-cell lymphoma, and provide a simple and feasible immunohistochemical marker for the diagnosis and research of composite lymphoma.
目的： 探讨血管免疫母细胞性T细胞淋巴瘤（AITL）伴B细胞增生或肿瘤的临床特征、病理形态、免疫表型、分子生物学特点和鉴别诊断。 方法： 收集中山大学附属第一医院病理科2019年1月至2023年7月诊断的8例AITL伴B细胞增生或肿瘤病例，分别为AITL伴弥漫大B细胞淋巴瘤（DLBCL）1例及AITL伴B细胞增生7例，对其临床与病理组织学特征进行回顾性分析，并行免疫组织化学染色、荧光原位杂交及基因重排检测。 结果： 8例AITL患者中，男性5例，女性3例，年龄52~61岁，平均年龄为58岁；取颈部肿大淋巴结活检，镜下均可见淋巴结结构破坏，但组织学形态不一；部分病例具Burkitt样形态，肿瘤细胞胞体中等大，核略不规则；部分病例核仁明显，局部伴高内皮小静脉增生，伴有滤泡树突细胞（FDC）网架增生并破坏；肿瘤细胞起源于生发中心辅助T细胞，表达2个以上滤泡辅助T细胞标志物，肿瘤组织周围尚可见呈结节状或弥漫片状增殖的B细胞，初诊时易被考虑为B细胞淋巴瘤。8例AITL病例的T细胞受体（TCR）克隆性基因重排检测结果均为阳性，其中5例伴有免疫球蛋白重链基因（IgH）重排阳性，8例中有7例行C-MYC基因断裂检测，均为阴性。8例中有6例免疫母细胞样B细胞EB病毒编码的RNA（EBER）原位杂交检测呈阳性。在AITL伴DLBCL病例中，肿瘤性B细胞C-MYC呈阳性表达（阳性率>40%），而AITL伴B细胞增生的7例中，增生性B细胞C-MYC为阴性（阳性率<40%）。 结论： AITL伴B细胞增生或肿瘤的病理形态不典型，诊断需要结合临床、病理形态、免疫表型及分子检测结果综合分析，容易误诊、漏诊。C-MYC或可作为鉴别B细胞增生与肿瘤的可行性指标，为复合性淋巴瘤的诊断和研究提供简便可行的免疫标志物。.
目的： 探讨血管免疫母细胞性T细胞淋巴瘤（AITL）伴B细胞增生或肿瘤的临床特征、病理形态、免疫表型、分子生物学特点和鉴别诊断。 方法： 收集中山大学附属第一医院病理科2019年1月至2023年7月诊断的8例AITL伴B细胞增生或肿瘤病例，分别为AITL伴弥漫大B细胞淋巴瘤（DLBCL）1例及AITL伴B细胞增生7例，对其临床与病理组织学特征进行回顾性分析，并行免疫组织化学染色、荧光原位杂交及基因重排检测。 结果： 8例AITL患者中，男性5例，女性3例，年龄52~61岁，平均年龄为58岁；取颈部肿大淋巴结活检，镜下均可见淋巴结结构破坏，但组织学形态不一；部分病例具Burkitt样形态，肿瘤细胞胞体中等大，核略不规则；部分病例核仁明显，局部伴高内皮小静脉增生，伴有滤泡树突细胞（FDC）网架增生并破坏；肿瘤细胞起源于生发中心辅助T细胞，表达2个以上滤泡辅助T细胞标志物，肿瘤组织周围尚可见呈结节状或弥漫片状增殖的B细胞，初诊时易被考虑为B细胞淋巴瘤。8例AITL病例的T细胞受体（TCR）克隆性基因重排检测结果均为阳性，其中5例伴有免疫球蛋白重链基因（IgH）重排阳性，8例中有7例行C-MYC基因断裂检测，均为阴性。8例中有6例免疫母细胞样B细胞EB病毒编码的RNA（EBER）原位杂交检测呈阳性。在AITL伴DLBCL病例中，肿瘤性B细胞C-MYC呈阳性表达（阳性率>40%），而AITL伴B细胞增生的7例中，增生性B细胞C-MYC为阴性（阳性率<40%）。 结论： AITL伴B细胞增生或肿瘤的病理形态不典型，诊断需要结合临床、病理形态、免疫表型及分子检测结果综合分析，容易误诊、漏诊。C-MYC或可作为鉴别B细胞增生与肿瘤的可行性指标，为复合性淋巴瘤的诊断和研究提供简便可行的免疫标志物。.
摘要：
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