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Microenvironmental and Molecular Pathways Driving Dormancy Escape in Bone Metastases.

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Disseminated tumor cells (DTCs) in bone can remain dormant for years. This review explores how the bone microenvironment triggers DTCs to reawaken, leading to cancer relapse, and discusses potential therapies to prevent this escape.

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Area of Science:

  • Oncology
  • Cancer Metastasis
  • Bone Biology

Background:

  • Bone metastases are a major cause of death in advanced cancers.
  • Disseminated tumor cells (DTCs) can enter a dormant state in bone, leading to late relapse.
  • Mechanisms of dormancy escape are poorly understood but critical for preventing metastasis.

Purpose of the Study:

  • To review emerging evidence on how the bone microenvironment promotes dormancy escape of DTCs.
  • To discuss factors within the bone niche that facilitate tumor cell reactivation.
  • To evaluate therapeutic strategies targeting dormancy escape.

Main Methods:

  • Literature review synthesizing current research on bone metastasis dormancy and reactivation.
  • Analysis of molecular, cellular, and systemic factors influencing tumor cell persistence and escape.
  • Evaluation of therapeutic interventions for managing dormant bone metastases.

Main Results:

  • Bone resorption releases growth factors (e.g., TGF-β, IGF-1) that fuel reactivation.
  • Disruption of osteoblast-mediated quiescence and adipocyte support promote proliferation.
  • Immune suppression, ECM remodeling, and systemic factors contribute to dormancy escape.
  • Epigenetic and metabolic reprogramming enable tumor cell reactivation.

Conclusions:

  • The bone microenvironment actively orchestrates dormancy escape through various cues.
  • Targeting osteoclast activity, immune suppression, and metabolic pathways may prevent relapse.
  • Further research is needed to identify key knowledge gaps and develop effective interventions.