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
1735 - mTOR inhibition in the treatment of resistant breast cancer
Presenter: María Rodriguez
Session: Poster Display session 1
Resources:
Abstract
6068 - Study of Photodynamic therapy in vitro
Presenter: Irene Jiménez Munguía
Session: Poster Display session 1
Resources:
Abstract
3011 - The potential of neratinib plus dasatinib in overcoming and preventing neratinib resistance in HER2-positive breast cancer models
Presenter: Neil Conlon
Session: Poster Display session 1
Resources:
Abstract
2644 - Novel HDACi, MHY446, induces apoptosis via regulation of mitochondria-endoplasmic reticulum interaction in HCT116 human colorectal cancer cells
Presenter: Nam Deuk Kim
Session: Poster Display session 1
Resources:
Abstract
3085 - Dual inhibition of TGF-β and AXL as a novel treatment for colorectal cancer
Presenter: Davide Ciardiello
Session: Poster Display session 1
Resources:
Abstract
1314 - PARP inhibition enhances cisplatin sensitivity in cervical cancer by modulating β-catenin signaling
Presenter: Minakshi Mann
Session: Poster Display session 1
Resources:
Abstract
2417 - Synergistic effect of DSF combined treatment with cisplatin in atypical teratoid/rhabdoid tumors (AT/RT)
Presenter: Seung Ah Choi
Session: Poster Display session 1
Resources:
Abstract
1149 - Reactive oxygen species induced by OSU-A9 inhibit the growth of duodenal cancer and gastric cancer cells through dephosphorylating intranuclear pyruvate kinase muscle isozyme M2
Presenter: Li-Yuan Bai
Session: Poster Display session 1
Resources:
Abstract
1862 - New therapy for intrahepatic cholangiocarcinoma targeted to cancer associated fibroblasts
Presenter: Takahiro Yamanaka
Session: Poster Display session 1
Resources:
Abstract
782 - Macrophage-cancer cell fusion is mediated by Phosphatidylserine-CD36 receptor interaction and induced by ionizing radiation
Presenter: Ivan Shabo
Session: Poster Display session 1
Resources:
Abstract