In pediatric acute myeloid leukemia (AML), cytogenetic abnormalities are strong indicators of prognosis. Some recurrent cytogenetic abnormalities, such as t(8;16)(p11;p13), are so rare that collaborative studies are required to define their prognostic impact. We collected the clinical characteristics, morphology, and immunophenotypes of 62 pediatric AML patients with t(8;16)(p11;p13) from 18 countries participating in the International Berlin-Frankfurt-Münster (I-BFM) AML study group. We used the AML-BFM cohort diagnosed from 1995-2005 (n = 543) as a reference cohort. Median age of the pediatric t(8;16)(p11;p13) AML patients was significantly lower (1.2 years). The majority (97%) had M4-M5 French-American-British type, significantly different from the reference cohort. Erythrophagocytosis (70%), leukemia cutis (58%), and disseminated intravascular coagulation (39%) occurred frequently. Strikingly, spontaneous remissions occurred in 7 neonates with t(8;16)(p11;p13), of whom 3 remain in continuous remission. The 5-year overall survival of patients diagnosed after 1993 was 59%, similar to the reference cohort (P = .14). Gene expression profiles of t(8;16)(p11;p13) pediatric AML cases clustered close to, but distinct from, MLL-rearranged AML. Highly expressed genes included HOXA11, HOXA10, RET, PERP, and GGA2. In conclusion, pediatric t(8;16)(p11;p13) AML is a rare entity defined by a unique gene expression signature and distinct clinical features in whom spontaneous remissions occur in a subset of neonatal cases.

译文

:在小儿急性髓细胞性白血病(AML)中,细胞遗传学异常是预后的重要指标。一些复发性细胞遗传学异常,如t(8; 16)(p11; p13)很少见,因此需要开展合作研究来确定其预后影响。我们收集了来自18个参加国际柏林-法兰克福-明斯特(I-BFM)AML研究组的国家的62例t(8; 16)(p11; p13)的小儿AML患者的临床特征,形态和免疫表型。我们使用1995-2005年诊断的AML-BFM队列(n = 543)作为参考队列。小儿t(8; 16)(p11; p13)AML患者的中位年龄明显较低(1.2岁)。大多数(97%)患有M4-M5法裔-美国-英国类型,与参考队列有显着差异。频繁发生红细胞吞噬作用(70%),皮肤角质白血病(58%)和弥散性血管内凝血(39%)。令人惊讶的是,有7例t(8; 16)(p11; p13)的新生儿自发缓解,其中3例持续缓解。 1993年后确诊的患者的5年总生存率为59%,与参考队列相似(P = 0.14)。 t(8; 16)(p11; p13)儿科AML病例的基因表达谱聚集在MLL重排的AML附近,但与MLL重排的AML不同。高度表达的基因包括HOXA11,HOXA10,RET,PERP和GGA2。总之,小儿t(8; 16)(p11; p13)AML是一种罕见的实体,由独特的基因表达特征和独特的临床特征所定义,这些特征在一部分新生儿病例中会自发缓解。

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