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BRCA1/2 Functional Loss Defines a Targetable Subset in Leiomyosarcoma

Nathan D Seligson1,2, Esko A Kautto3, Edward N Passen4

  • 1Division of Pharmacy Practice and Science, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA.

The Oncologist
|December 14, 2018
PubMed
Abstract

Insights

Uterine leiomyosarcoma (uLMS) shows a higher frequency of BRCA2 alterations. Patients with uLMS and BRCA2 loss may benefit from PARP inhibitors, warranting further investigation.

Area of Science:

  • Oncology
  • Genetics
  • Molecular Biology

Background:

  • Soft-tissue sarcomas (STS) are a diverse group of mesenchymal tumors with limited therapeutic options.
  • The prevalence and clinical significance of homologous recombination (HR) DNA repair pathway alterations, including BRCA1/2, in STS subtypes require further elucidation.
  • This study aims to characterize HR pathway alterations across various STS subtypes, with a focus on leiomyosarcoma (LMS).

Observation:

  • Analysis of 1,236 STS patient samples revealed BRCA2 alterations in 15 (1%) and homozygous BRCA2 loss in 9 (<1%) patients.
  • Subset analysis demonstrated that BRCA2 alterations were significantly concentrated in uterine LMS (uLMS), occurring in 10% of uLMS tumors.
  • Four uLMS patients with BRCA2 loss exhibited a durable clinical response to poly (ADP-ribose) polymerase (PARP) inhibition.

Findings:

  • Homologous recombination pathway alterations are infrequent in the general STS population.
  • Uterine LMS is uniquely enriched for BRCA2 loss compared to other STS subtypes.
  • PARP inhibitors demonstrated clinical efficacy in a small cohort of uLMS patients with BRCA2 loss.

Implications:

  • Patients with uLMS should be considered for somatic BRCA2 profiling due to the increased prevalence of these alterations.
  • The findings suggest that uLMS patients with BRCA2 loss may benefit from targeted therapy with PARP inhibitors.
  • Prospective clinical trials are essential to validate the efficacy of PARP inhibition in uLMS and establish its role in treatment strategies.
Keywords:
DNA repairHomologous recombinationPoly (ADP‐ribose) polymerase inhibitorsSarcoma

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