Germline variants in patients diagnosed with pediatric soft tissue sarcoma
DOI:
https://doi.org/10.2340/1651-226X.2024.40730Keywords:
Soft tissue sarcoma, pathogenic germline variants, hereditary, MYO3A, MYO5B, CHD1LAbstract
Background: While soft tissue sarcomas affect younger patients, few studies have assessed the distribution of underlying pathogenic germline variants.
Patients and methods: We retrospectively identified all pediatric and young adult patients (0–22 years) at Haukeland University Hospital, Norway (1981–2019), through clinical and pathological records. We identified n = 46 eligible patients. From these 46 patients, adequate material representing normal tissue was available for n = 41 cases (n = 24 diagnosed with rhabdomyosarcoma, 9 with synovial sarcomas, 2 with Ewing sarcomas, and 6 without further classification), with matching tumor tissue for n = 40. Normal tissue samples were analyzed for germline pathogenic variants (PVs) by targeted sequencing of 360 cancer genes.
Results: Out of the 41 analyzed cases, we found PVs or likely PVs in 7 (17%). These variants were found in TP53, MUTYH, FANCC, DICER1, FANCA, MYO3A, and MYO5B. Supporting the causality of these PVs, four cases revealed loss of heterozygosity (LOH) of the wild-type allele in the tumor tissue, one patient with a PV in DICER1 had a second somatic variant in DICER1, and a patient with a PV in TP53 had the altered allele amplified in the tumor. For three out of five with available family history, a history of other cancers in relatives was recorded. Among genes with variants of uncertain significance, CHD1L was of particular interest, revealing a stop-gain and a missense variant.
Interpretation: A high fraction of young patients with soft tissue sarcoma harbor PVs. Among the genes affected, we substantiate a potential role of MYO5B and propose a potential role for MYO3A.
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