Abstract 3914
Background
Sarcoma is a rare disease affecting both bone and connective tissue and with over 100 pathologic entities, diagnosis can be difficult. Approximately one third of sarcoma patients however are characterised by recurrent genetic alterations mainly chromosomal translocations, which result in fusion genes, and gene amplifications. Fusion genes are highly useful diagnostic markers and are currently identified in the clinical setting using FISH/RT-PCR. Conversely, conclusive results cannot be achieved in up to 25% of fusion positive patients using these methods. Next generation sequencing (NGS) is a promising tool that can improve soft-tissue sarcoma diagnosis.
Methods
A novel sarcoma-specific NGS gene capture panel containing probes for 90 fusion genes and 7 genes with frequent copy number changes was designed, optimised and validated in order to improve fusion-positive sarcoma diagnosis. Genomic DNA was extracted from 92 well-characterised FFPE samples and libraries prepared using the KAPA Hyperplus kit (Roche) and hybridised using the SeqCap Hybridisation kit (Roche) and sequenced on a NextSeq platform (Illumina).
Results
Sarcoma specific translocations or gene amplifications were identified in 92 out of 94 cases giving the targeted gene panel a sensitivity of approximately 98% and specificity of 100% (Table).Table:
1717P Sarcoma tumour types and number of cases with structural variants or copy number variations detected
Soft Tissue Tumour Type | No. of cases | SV/CNV detected |
---|---|---|
Synovial Sarcoma | 25 | 25 |
Alveolar Rhabdomyosarcoma | 6 | 6 |
Well/Dedifferentiated Liposarcoma | 9 | 8 |
Intimal Sarcoma | 1 | 1 |
Desmoplastic Small Round Cell Tumour (DSRCT) | 2 | 2 |
Ewing’s Sarcoma | 11 | 11 |
Inflammatory Myofibroblastic Tumour | 2 | 2 |
Myxoid Liposarcoma | 10 | 10 |
Chondroid Lipoma | 1 | 1 |
Clear Cell Sarcoma | 4 | 4 |
Epithelioid Haemangioendothelioma | 2 | 1 |
Low-grade Fibromyxoid Sarcoma | 3 | 3 |
Nodular Fasciitis | 1 | 1 |
Alveolar Soft Part Cell Sarcoma | 1 | 1 |
Congenital Fibrosarcoma | 2 | 2 |
Solitary Fibrous Tumour | 2 | 2 |
Aneurysmal Bone Cyst | 1 | 1 |
BCOR-CCNB3 Sarcoma | 1 | 1 |
Extraskeletal Myxoid Chondrosarcoma | 5 | 5 |
Mesenchymal Chondrosarcoma | 2 | 2 |
Dermatofibrosarcoma Protuberans (DFSP) | 3 | 3 |
TOTAL | 94 | 92 |
Conclusions
To the best of our knowledge this is the first sarcoma-specific NGS panel validated in FFPE-derived genomic DNA. It is at least as sensitive and specific as the combination of FISH and RT-PCR and can be implemented in routine clinical diagnostic workflows. We are currently investigating whether fusion genes can be detected in plasma using ctDNA from 14 patients and results will be reported at the conference.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
David Gonzalez de Castro.
Funding
Sarcoma UK.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
5135 - Dose adjustment of chemotherapy in aggressive lymphoma using automated and standardized analysis and evaluation of DNA double strand breaks
Presenter: Julia Schröder
Session: Poster Display session 1
Resources:
Abstract
4883 - A New Population Model Validated Pharmacokinetic Similarity of HLX01 and Rituximab in B-Cell Lymphoma
Presenter: Yuankai Shi
Session: Poster Display session 1
Resources:
Abstract
4908 - Efficacy of salvage therapy in the treatment of Helicobacter pylori-positive gastric low-grade mucosa-associated lymphoid tissue lymphoma
Presenter: Sung-Nam Lim
Session: Poster Display session 1
Resources:
Abstract
2360 - Mutational analysis of extranodal marginal zone lymphoma using next generation sequencing
Presenter: Seok Jae Huh
Session: Poster Display session 1
Resources:
Abstract
2430 - Clinical features, treatment and outcomes of colon and rectum mucosa-associated lymphoid tissue (MALT) lymphoma: Literature reviews published in English between 1993 and 2017
Presenter: Jeong Yeon Kim
Session: Poster Display session 1
Resources:
Abstract
4654 - Splenic marginal zone lymphoma: clinical characteristics and prognostic factors in a series of 52 patients
Presenter: Guldane Cengiz Seval
Session: Poster Display session 1
Resources:
Abstract
1732 - Safety and efficacy of Bendamustine and Rituximab (BR) regimen in Indian Chronic Lymphocytic Leukemia patients
Presenter: Ajay Gogia
Session: Poster Display session 1
Resources:
Abstract
5784 - N-terminal B-type natriuretic peptide (NT-proBNP) as an independed prognostic marker for patients with newly diagnosed multiple myeloma complicated by dialysis-dependent renal failure
Presenter: Sergey Semochkin
Session: Poster Display session 1
Resources:
Abstract
836 - The first-line effect of Bortezomib-based Therapy on Clinical Outcomes for Taiwanese Patients with multiple myeloma
Presenter: Ching-Liang Ho
Session: Poster Display session 1
Resources:
Abstract
2085 - Impact of Donor Lymphocyte Infusion in Relapsing Myeloid Neoplasms Post Allogeneic Hematopoietic Stem Cell Transplantation
Presenter: Hanafy Hafez
Session: Poster Display session 1
Resources:
Abstract