Neoplastic "Black Ops": cancer's subversive tactics in overcoming host defenses

Area of Science:

• Immunology
• Oncology

Background:

• Metastatic cancer is largely incurable, employing complex strategies to evade the immune system.
• Cancer cells can mimic self-cells, down-regulate MHC molecules, and interfere with antigen presentation to avoid T cell recognition.
• The immune system's regulatory mechanisms, designed to prevent autoimmunity, can paradoxically protect cancers.

Purpose of the Study:

• To review evidence of cancer actively promoting regulatory immune cell interactions for immune evasion.
• To highlight the role of regulatory B cells in suppressing anti-tumor immune responses.

Main Methods:

• Literature review of existing research on cancer immune evasion and regulatory immune cells.
• Analysis of the mechanisms by which cancer manipulates immune cells.

Main Results:

• Cancer utilizes diverse tactics to subvert immune surveillance, including molecular mimicry and antigen presentation interference.
• Regulatory immune cells, across various immune cell types, are crucial in controlling effector immune cell responses against tumors.
• Regulatory B cells play a significant role in suppressing anti-tumor immunity.

Conclusions:

• Cancer actively orchestrates cross-talk among regulatory immune cells to evade immunosurveillance.
• Tumors not only suppress immune function directly but also co-opt immune components to protect themselves from immune attack.