Cancer Cell Cannibalism: A Primeval Option to Survive

Area of Science:

• Oncology
• Cell Biology
• Cancer Research

Background:

• Cancer cell cannibalism involves larger cells engulfing smaller ones, often within vacuoles.
• Initially viewed as a curiosity, it's now recognized as aberrant phagocytosis by malignant cells.
• This behavior is linked to tumor malignancy, metastasis, and poor prognosis, especially in harsh microenvironments.

Purpose of the Study:

• To comprehensively review the role of transmembrane protein 9 superfamily member 4 (TM9SF4) in cancer.
• To highlight TM9SF4's crucial role in malignant cancer cell cannibalism.
• To compare and contrast tumor cannibalism with entosis, phagocytosis, and emperipolesis.

Main Methods:

• Literature review of studies on cancer cell cannibalism.
• Analysis of research linking TM9SF4 to cellular engulfment behaviors.
• Comparative study of different cell-engulfing phenomena.

Main Results:

• Cancer cells, particularly metastatic ones, exhibit cannibalism to survive, feeding on engulfed cells like lymphocytes and erythrocytes.
• TM9SF4, a transmembrane protein found in metastatic melanoma, is associated with this cannibalistic behavior.
• Tumor cell cannibalism can be a mechanism to evade immune responses by engulfing immune cells.

Conclusions:

• Cancer cell cannibalism is an adaptive survival strategy, potentially a regression to simpler life forms.
• TM9SF4 is identified as a key mediator of this phenomenon in malignant cells.
• Understanding tumor cannibalism and TM9SF4's role offers insights into cancer progression and immune evasion.