Molecular and Immune Mechanisms Governing Cancer Metastasis, Including Dormancy, Microenvironmental Niches, and...

Area of Science:

• Oncology and Cancer Biology
• Molecular and Cellular Biology
• Immunology

Background:

• Metastasis is the primary driver of cancer mortality, involving disseminated tumor cells (DTCs) adapting to distant organs.
• Understanding the complex interplay of molecular, immune, and environmental factors is crucial for combating metastatic disease.

Purpose of the Study:

• To review key molecular and immune mechanisms governing metastatic spread, survival, and outgrowth.
• To examine how tumor-intrinsic programs interact with the tumor microenvironment, including ECM remodeling and immune evasion.
• To highlight therapeutic strategies targeting both tumor cells and their microenvironment.

Main Methods:

• Review of existing literature on molecular pathways, epigenetic regulation, and immune evasion in metastasis.
• Analysis of gene networks, transcription factors (e.g., SNAIL, TWIST), and epigenetic modifiers (e.g., EZH2).
• Discussion of proteases, immune suppressive mechanisms, and metastatic dormancy.

Main Results:

• Identified key molecular drivers including EMT-linked factors, epigenetic reprogramming, and ECM-modifying enzymes.
• Described immune evasion strategies such as platelet shielding and myeloid suppression.
• Highlighted metastatic dormancy as a reversible survival state and a determinant of relapse.
• Emphasized shared metastatic principles across diverse cancers (e.g., osteosarcoma, melanoma, breast cancer) and their organotropisms.

Conclusions:

• Metastasis is a multi-step process driven by intricate interactions between tumor cells and their microenvironment.
• Targeting molecular plasticity, epigenetic states, immune evasion, and dormancy offers promising therapeutic avenues.
• Emerging strategies like immunotherapy combinations and epigenetic reprogramming aim for durable control of metastatic disease.