Epithelial-mesenchymal transition and cell cooperativity in metastasis

Area of Science:

• Oncology
• Cell Biology
• Cancer Metastasis

Background:

• The role of epithelial-mesenchymal transition (EMT) in cancer metastasis is debated.
• Existing models propose EMT as essential for invasion and metastasis.
• Skepticism exists regarding EMT's occurrence and necessity in cancer progression.

Purpose of the Study:

• To investigate the role of EMT in cancer metastasis.
• To propose an alternative model for EMT's function in metastasis.
• To elucidate the cooperative roles of EMT and non-EMT cells in metastasis.

Main Methods:

• Analysis of findings related to EMT and cancer metastasis.
• Discussion of proposed models including incomplete EMT, MET, and collective migration.
• Formulation of a new model based on experimental observations.

Main Results:

• EMT cells facilitate matrix degradation, enabling invasion and intravasation for both EMT and non-EMT cells.
• Only non-EMT cells successfully establish colonies at secondary sites.
• EMT and non-EMT cells appear to cooperate in the metastatic process.

Conclusions:

• EMT is not strictly required for metastasis; it facilitates the process.
• A cooperative model involving both EMT and non-EMT cells explains spontaneous metastasis.
• This revised understanding impacts therapeutic strategies targeting cancer spread.