Abstract
3D genomics identify alternate mechanisms of homologous recombination deficiency in uterine sarcoma.
Author
person
Sarah Chiang
Memorial Sloan Kettering Cancer Center, New York, NY
info_outline
Sarah Chiang, Martee Leigh Hensley, Varshini Vasudevaraja, Ivy Tran, Yiying Yang, Colin JR Stewart, Kay J Park, Lora H Ellenson, Kristin Sikkink, Anthony Schmitt, Matija Snuderl
Full text
Authors
person
Sarah Chiang
Memorial Sloan Kettering Cancer Center, New York, NY
info_outline
Sarah Chiang, Martee Leigh Hensley, Varshini Vasudevaraja, Ivy Tran, Yiying Yang, Colin JR Stewart, Kay J Park, Lora H Ellenson, Kristin Sikkink, Anthony Schmitt, Matija Snuderl
Organizations
Memorial Sloan Kettering Cancer Center, New York, NY, NYU Langone Health, New York, NY, King Edward Memorial Hospital, Perth, Australia, Arima Genomics, San Diego, CA
Abstract Disclosures
Research Funding
Pharmaceutical/Biotech Company
Arima Genomics, U.S. National Institutes of Health, NYU Langone Health
Background:
Uterine sarcomas are rare tumors with diverse morphologic appearances, genetic underpinnings, and clinical behavior. Molecular characterization of these tumors by next generation sequencing (NGS) has improved disease classification and prognostication, but its impact on therapeutic selection remains limited. Analysis of 3D genomics datasets has recently been shown to detect large complex structural variants (SV) and chromatin architecture in normal and diseased human tissues. We applied genome-wide chromosome conformation capture (Hi-C) techniques in a variety of uterine sarcomas to identify novel therapeutic targets.
Methods:
Formalin-fixed paraffin-embedded tissue from 48 primary or recurrent uterine sarcomas were subjected to Hi-C to identify chromosomal rearrangements. The cohort included leiomyosarcoma (LMS, n = 7), adenosarcoma (AS, n = 7), endometrial stromal sarcoma (n = 7; high grade (HGESS), n = 4; low grade (LGESS), n = 3), sarcoma not otherwise specified (n = 17; high grade (HGNOS), n = 10, low grade (LGNOS), n = 7), undifferentiated uterine sarcoma (UUS, n = 6) and heterologous sarcoma (n = 2). Tumors were previously subjected to targeted DNA (n = 10) and/or RNA (n = 26) NGS with no therapeutic targets identified and only
BCOR
internal tandem duplication detected in a HGESS.
Results:
Hi-C detected SV in 73% of uterine sarcomas (n = 35/48), including those previously negative by targeted RNA NGS (n = 25/26). Homologous recombination repair (HRR) gene alterations were detected by Hi-C in 42% of tumors (n = 20/48), including AS (n = 5/7), HGESS (n = 2/4), LGESS (n = 1/3), LMS (n = 2/7), UUS (n = 2/6), heterologous sarcoma (n = 1/2), HGNOS (n = 3/10) and LGNOS (n = 1/7). SV included gene (gene to gene, n = 3; gene to non-coding DNA, n = 8) and proximity (n = 13) fusions disrupting HRR genes (
ATM
,
BRIP1
,
CDK12
,
CHEK1
,
CHEK2
,
NBN
,
PARP3
,
RAD51B
,
RAD51C
,
RAD51D
) with enrichment for
RAD51B
fusions (50%, n = 10/20). Among all tumors with HRR gene alterations detected by Hi-C, only one uterine sarcoma harbored a missense
ATM
mutation by targeted DNA NGS (n = 1/5).
Conclusions:
Molecular characterization of uterine sarcomas by Hi-C may uncover HRR gene alterations not currently detectable by targeted DNA and RNA NGS. Homologous recombination deficiency (HRD) is not limited to LMS and may frequently result from SV, particularly between HRR gene to non-coding DNA in a variety of uterine sarcomas. These alternate mechanisms for HRD may serve as a potential therapeutic biomarker for HRD-targeted therapy in uterine sarcoma.
Clinical status
Pre-clinical
7 organizations
10 drugs
10 targets
Organization
Memorial Sloan Kettering Cancer CenterOrganization
New York, NYOrganization
NYU Langone Health, New York, NYOrganization
King Edward Memorial HospitalOrganization
Perth, AustraliaOrganization
Arima GenomicsOrganization
San Diego, CADrug
ATMDrug
BRIP1Drug
CDK12Drug
CHEK1Drug
CHEK2Drug
NBNDrug
PARP3Drug
RAD51BDrug
RAD51CDrug
RAD51DTarget
ATMTarget
CDK12Target
RAD51DTarget
CHEK2Target
RAD51BTarget
RAD51CTarget
BRIP1Target
NBNTarget
CHEK1Target
PARP3