Abstract 2728
Background
Approximately one-third of the patients with well-differentiated liposarcoma (WDLPS) will develop a local recurrence after resection of the primary tumor. Not much is known about the molecular relationship between the primary tumor and the recurrent tumor, which is important to reveal potential drivers of recurrence. Here we investigated the biology of recurrent WDLPS by comparing paired primary and recurrent WDLPS using microRNA profiling and genome-wide DNA methylation analyses.
Methods
Paired primary and recurrent WDLPS formalin-fixed and paraffin-embedded tumor samples were collected (N = 27 pairs). MicroRNA expression profiles were determined using TaqMan® Low Density Array (TLDA) cards, capable of detecting 754 microRNAs. Genome-wide DNA methylation and differentially methylated regions were assessed by methylated DNA sequencing (MeD-seq).
Results
A supervised cluster analysis based on differentially expressed microRNAs between paired primary and recurrent WDLPS did not reveal a clear cluster pattern separating the primary from the recurrent tumors. The clustering was also not based on tumor localization, time to recurrence, age or the status of the resection margins. Changes in DNA methylation between primary and recurrent tumors were extremely variable, and no consistent DNA methylation changes were found. As a result, a supervised clustering analysis based on differentially methylated regions between primary and recurrent tumors did not show a distinct cluster pattern based on any of the features. Subgroup analysis for tumors localized in the extremity or the retroperitoneum also did not yield a clear distinction between primary and recurrent WDLPS samples.
Conclusions
Primary and recurrent WDLPS could not be distinguished based on microRNA expression and DNA methylation profiles and no common microRNA and DNA methylation alterations for recurrence could be identified.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
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