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Next Generation Sequencing for the Detection of Actionable Mutations in Solid and Liquid Tumors
Published on: September 20, 2016
Validation of Guidelines for Genetic Investigation of Myeloid Neoplasms with Germline Predisposition: Results from a
Bianca Tesi1,2,3, Anna Robelius4, Berivan Baskin5,6
1Department of Clinical Genetics and Genomics, Karolinska University Hospital, Stockholm, Sweden.
Purpose:
In a multicenter prospective cohort study, we assessed the diagnostic yield of the Nordic guidelines for germline investigation in myeloid neoplasms and mapped the spectrum of inherited and somatic variants.
Experimental Design:
Eighty-five patients (acute myeloid leukemia, n = 38; myelodysplastic syndromes, n = 26; thrombocytopenia, n = 14; and other, n = 7) fulfilling the Nordic criteria for germline investigation, based on (i) medical history or family history suggestive of a germline condition and (ii) relevant findings from the somatic diagnostic work-up (CytoMol), were recruited. The genetic analysis included enhanced whole-exome sequencing (n = 69) or sequencing of specific variants of interest (n = 16).
Results:
Pathogenic or likely pathogenic (P/LP) germline variants were identified in 35% of patients (30/85). The diagnostic yield varied from 6% (1/16) in the family history group to 52% (17/33) in the CytoMol group. Germline DDX41 P/LP variants were the most frequent finding (13/30, 43% of all positive cases) almost exclusively found within the CytoMol group (12/13). Seven variants of unknown significance were also detected (TERT n = 2 and DDX41, RTEL1, ETV6, PARN, and SAMD9 n = 1). Five patients carried a P/LP variant in genes associated with another hereditary cancer syndrome (BRCA1 n = 3; PALB2 n = 1; and CHEK2; n = 1). Survival analysis showed a trend for longer survival among patients with acute myeloid leukemia and confirmed or suspected germline predisposition that underwent allogeneic stem cell transplantation.
Conclusions:
The implementation of the Nordic guidelines in a prospective Swedish cohort results in a high overall diagnostic yield (35%), proving the feasibility and utility of these or similar guidelines in a clinical setting.
