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Shwachman-Diamond 综合征中骨髓恶性肿瘤的易感性:生物学见解和临床进展。

Predisposition to myeloid malignancies in Shwachman-Diamond syndrome: biological insights and clinical advances.

机构信息

Division of Hematological Malignancies, Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, MA.

Department of Pediatric Hematology/Oncology, Dana-Farber/Boston Children's Cancer and Blood Disorders Center, Boston, MA.

出版信息

Blood. 2023 Mar 30;141(13):1513-1523. doi: 10.1182/blood.2022017739.

Abstract

Shwachman-Diamond syndrome (SDS) is an inherited multisystem ribosomopathy characterized by exocrine pancreatic deficiency, bone marrow failure, and predisposition to myeloid malignancies. The pathobiology of SDS results from impaired ribosomal maturation due to the deficiency of SBDS and the inability to evict the antiassociation factor eIF6 from the 60S ribosomal subunit. Clinical outcomes for patients with SDS who develop myeloid malignancies are extremely poor because of high treatment-related toxicities and a high rate of refractory disease/relapse even after allogeneic hematopoietic stem cell transplant (HSCT). Registry data indicate that outcomes are improved for patients with SDS who undergo routine bone marrow surveillance and receive an HSCT before developing an overt malignancy. However, the optimal approach to hematologic surveillance and the timing of HSCT for patients with SDS is not clearly established. Recent studies have elucidated distinct patterns of somatic blood mutations in patients with SDS that either alleviate the ribosome defect via somatic rescue (heterozygous EIF6 inactivation) or disrupt cellular checkpoints, resulting in increased leukemogenic potential (heterozygous TP53 inactivation). Genomic analysis revealed that most myeloid malignancies in patients with SDS have biallelic loss-of-function TP53 mutations. Single-cell DNA sequencing of SDS bone marrow samples can detect premalignant biallelic TP53-mutated clones before clinical diagnosis, suggesting that molecular surveillance may enhance the detection of incipient myeloid malignancies when HSCT may be most effective. Here, we review the clinical, genetic, and biologic features of SDS. In addition, we present evidence supporting the hematologic surveillance for patients with SDS that incorporates clinical, pathologic, and molecular data to risk stratify patients and prioritize transplant evaluation for patients with SDS with high-risk features.

摘要

Shwachman-Diamond 综合征(SDS)是一种遗传性多系统核糖体病,其特征为外分泌胰腺功能不全、骨髓衰竭以及骨髓增生异常恶性肿瘤易感性。SDS 的病理生物学是由于 SBDS 缺乏导致核糖体成熟受损,以及无法将反关联因子 eIF6 从 60S 核糖体亚基中逐出。SDS 患者发生骨髓增生异常恶性肿瘤的临床结局极差,这是因为治疗相关毒性高,并且即使在异基因造血干细胞移植(HSCT)后,难治性疾病/复发率也很高。登记数据表明,对于常规骨髓监测并在出现明显恶性肿瘤之前接受 HSCT 的 SDS 患者,其结局得到改善。然而,对于 SDS 患者进行血液学监测的最佳方法以及 HSCT 的时机尚不清楚。最近的研究阐明了 SDS 患者的体细胞血液突变存在不同模式,这些突变通过体细胞挽救减轻核糖体缺陷(杂合子 EIF6 失活)或破坏细胞检查点,从而增加白血病形成潜能(杂合子 TP53 失活)。基因组分析显示,SDS 患者的大多数骨髓增生异常恶性肿瘤均存在双等位基因功能丧失性 TP53 突变。SDS 骨髓样本的单细胞 DNA 测序可在临床诊断前检测到恶性前的双等位基因 TP53 突变克隆,这表明分子监测可能在 HSCT 最有效的时候增强对初期骨髓恶性肿瘤的检测。在此,我们综述了 SDS 的临床、遗传和生物学特征。此外,我们提供了支持 SDS 患者血液学监测的证据,该监测纳入了临床、病理和分子数据,以对患者进行风险分层,并为具有高危特征的 SDS 患者优先进行移植评估。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c454/10082379/13ed237eaf9a/BLOOD_BLD-2022-017739-C-fx1.jpg

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