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MiT家族易位性肾细胞癌:从早期描述到当前认知

MiT Family Translocation Renal Cell Carcinoma: from the Early Descriptions to the Current Knowledge.

作者信息

Caliò Anna, Segala Diego, Munari Enrico, Brunelli Matteo, Martignoni Guido

机构信息

Department of Diagnostic and Public Health, Section of Pathology, University of Verona, Verona 37134, Italy.

Department of Pathology, Pederzoli Hospital, Peschiera del Garda 37019, Italy.

出版信息

Cancers (Basel). 2019 Aug 3;11(8):1110. doi: 10.3390/cancers11081110.

Abstract

The new category of MiT family translocation renal cell carcinoma has been included into the World Health Organization (WHO) classification in 2016. The MiT family translocation renal cell carcinoma comprises Xp11 translocation renal cell carcinoma harboring gene fusions and t(6;11) renal cell carcinoma harboring gene fusion. At the beginning, they were recognized in childhood; nevertheless, it has been demonstrated that these neoplasms can occur in adults as well. In the nineties, among Xp11 renal cell carcinoma, , , and () were the first genes recognized as partners in rearrangement. Recently, many other genes have been identified, and a wide spectrum of morphologies has been described. For this reason, the diagnosis may be challenging based on the histology, and the differential diagnosis includes the most common renal cell neoplasms and pure epithelioid PEComa/epithelioid angiomyolipoma of the kidney. During the last decades, many efforts have been made to identify immunohistochemical markers to reach the right diagnosis. To date, staining for PAX8, cathepsin K, and melanogenesis markers are the most useful identifiers. However, the diagnosis requires the demonstration of the chromosomal rearrangement, and fluorescent in situ hybridization (FISH) is considered the gold standard. The outcome of Xp11 translocation renal cell carcinoma is highly variable, with some patients surviving decades with indolent disease and others dying rapidly of progressive disease. Despite most instances of t(6;11) renal cell carcinoma having an indolent clinical course, a few published cases demonstrate aggressive behavior. Recently, renal cell carcinomas with amplification have been described in connection with t(6;11) renal cell carcinoma. Those tumors appear to be associated with a more aggressive clinical course. For the aggressive cases of MiT family translocation carcinoma, the optimal therapy remains to be determined; however, new target therapies seem to be promising, and the search for predictive markers is mandatory.

摘要

MiT家族易位性肾细胞癌这一新类别于2016年被纳入世界卫生组织(WHO)分类。MiT家族易位性肾细胞癌包括携带基因融合的Xp11易位性肾细胞癌和携带基因融合的t(6;11)肾细胞癌。起初,它们在儿童期被发现;然而,现已证明这些肿瘤也可发生于成人。在20世纪90年代,在Xp11肾细胞癌中, 、 和 ()是最早被确认为重排伙伴的基因。最近,又鉴定出许多其他基因,并描述了广泛的形态学特征。因此,基于组织学进行诊断可能具有挑战性,鉴别诊断包括最常见的肾细胞肿瘤以及肾脏的纯上皮样PEComa/上皮样血管平滑肌脂肪瘤。在过去几十年中,人们为确定免疫组化标志物以做出正确诊断付出了诸多努力。迄今为止,PAX8、组织蛋白酶K和黑素生成标志物染色是最有用的识别方法。然而,诊断需要证明染色体重排,荧光原位杂交(FISH)被认为是金标准。Xp11易位性肾细胞癌的预后差异很大,一些患者患惰性疾病存活数十年,而另一些患者则因疾病进展迅速死亡。尽管大多数t(6;11)肾细胞癌病例临床病程呈惰性,但少数已发表的病例显示出侵袭性。最近,已描述了与t(6;11)肾细胞癌相关的具有 扩增的肾细胞癌。那些肿瘤似乎与更具侵袭性的临床病程相关。对于MiT家族易位性癌的侵袭性病例,最佳治疗方案仍有待确定;然而,新的靶向治疗似乎很有前景,寻找预测标志物是必不可少的。

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