Abstract 5097
Background
Sarcoma are a heterogeneous group of tumor which can be split into two subgroups with distinct genetics. Half of sarcoma presents an important genomic reorganization correlated to tumor aggressiveness. At this stage, the origin of this instability is still unknown. Cell fusion is a physiological mechanism involved in several processes including myoblast differentiation and already described to be involved in aneuploidy generation and genomic instability. We thus hypothesized that cell fusion could participate to sarcoma oncogenesis by generating genomic instability.
Methods
We established cell line of hybrids from spontaneous fusion of immortalized myoblasts. Tumor and metastasis development were evaluated upon grafting and whole genome and transcriptome sequencing with in-vitro mechanistic studies were performed to decipher phenotypes acquired by hybrids upon fusion.
Results
In vitro hybrid cell lines show a more aggressive phenotype than parental cell lines by increasing proliferation and clonogenic capacities. Only hybrids form tumors upon grafting and may develop also metastasis. Aneuploidy triggered by cell fusion induces genome reorganization and in vivo tumor genome show alterations corresponding to those observed in human rhabdomyosarcoma. Indeed, 85% of hybrid tumors harbor DMD deletions as observed in sarcoma with myogenic origin. The study of this protein reveals that tumors lose the expression of Dp427 isoform which is the one reported as a tumor suppressor. This malignant transformation of hybrids is associated to transcriptomic remodeling toward a decrease of the expression of genes involved in muscle differentiation.
Conclusions
To our knowledge, this is the first model able to reproduce the complex genomic of sarcoma. The detection of those hybrid cells in sarcoma tumor allowed us to push forward they are involved in sarcoma development and progression and their quantification in tumors or in circulating cells could thus establish an early prognostic marker. Finally, specific therapeutic targeting of this hybrids could represent new approach.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
Frederic Chibon.
Funding
Association pour la Recherche contre le Cancer (ARC) Fondation pour la Recherche Médicale (FRM).
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
4085 - A Phase 1, Open-Label, Dose-Escalation Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Antitumor Activity of ADCT-601 in Patients with Advanced Solid Tumors
Presenter: Anthony Tolcher
Session: Poster Display session 1
Resources:
Abstract
1054 - Safety, efficacy, and pharmacokinetic (PK) profile of cosibelimab, an anti‐PD‐L1 antibody, in patients (pts) with advanced cancers
Presenter: Philip Clingan
Session: Poster Display session 1
Resources:
Abstract
4264 - A Phase I study of tinostamustine in patients (pts) with advanced solid tumours
Presenter: Alain Mita
Session: Poster Display session 1
Resources:
Abstract
3811 - Lurbinectedin (LUR) in combination with Irinotecan (IRI) in patients (pts) with advanced solid tumors
Presenter: Santiago Ponce Aix
Session: Poster Display session 1
Resources:
Abstract
1311 - A phase I study of varlitinib (VAR; ASLAN001) an oral pan-HER tyrosine kinase inhibitor (TKI) combined with mFOLFIRI chemotherapy in advanced solid tumors
Presenter: Aaron Tan
Session: Poster Display session 1
Resources:
Abstract
3482 - Phase I study of lapatinib and trametinib in patients with KRAS mutant colorectal, non-small cell lung and pancreatic cancer
Presenter: Sanne Huijberts
Session: Poster Display session 1
Resources:
Abstract
4749 - Pharmacokinetic (PK) and updated survival data from the Canadian Cancer Trials Group IND.226 study of durvalumab ± tremelimumab in combination with platinum-doublet chemotherapy
Presenter: Desiree Hao
Session: Poster Display session 1
Resources:
Abstract
4530 - A Phase 2a clinical trial combining ALRN-6924 and palbociclib for the treatment of patients with tumors harboring wild-type p53 and MDM2 amplification or MDM2/CDK4 co-amplification
Presenter: Funda Meric-Bernstam
Session: Poster Display session 1
Resources:
Abstract
4280 - Updated Efficacy and Safety of Entrectinib in Patients with NTRK Fusion-Positive Tumors: Integrated Analysis of STARTRK-2, STARTRK-1 and ALKA-372-001
Presenter: Christian Rolfo
Session: Poster Display session 1
Resources:
Abstract
6144 - An international randomized cross-over bio-equivalence study of oral paclitaxel + HM30181 compared with weekly intravenous (IV) paclitaxel in patients with advanced solid tumors
Presenter: Christopher Jackson
Session: Poster Display session 1
Resources:
Abstract