Core Framework & Diagram How Does the Immune System Detects Cancer Cells? 2
7 月 6, 2026Core Framework & Diagram How Do Cancer Cells Evade the Immune System? 2
7 月 6, 2026
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How Do Cancer Cells Evade the Immune System?
Cancer cells aren't just randomly growing — they're actively learning how to make the immune system blind to them
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If the immune system searches for and clears cancerous cells every day, why do people still develop cancer?
The answer isn't 'the immune system failed' — it's 'some cancer cells got too clever.' Cancer cells that develop into tumors are survivors filtered through layers of immune screening. They didn't survive randomly — they're the cells that happened to evolve strategies for making the immune system 'blind' or 'shut down.'
This process is called immune evasion. Understanding it is key to understanding why tumors form, why some immunotherapies work, and why some tumors don't respond to treatment.
核心要点
01
Cancer cells that develop into tumors are survivors filtered by immune selection pressure, having evolved multiple immune evasion mechanisms — survivorship bias, not luck.
02
PD-L1 is the most critical 'immune shutdown switch': tumor cells use it to directly shut off approaching T cells. This is exactly why anti-PD-1/PD-L1 therapy has achieved such major clinical success.
03
MHC-I downregulation blinds T cells but triggers NK cells — tumors evolved selective HLA-E upregulation to simultaneously handle both. The target is anti-NKG2A antibodies.
04
Tumors can co-opt immune cells (macrophages, Tregs) to become accomplices — more dangerous and harder to counter than just making the immune system 'blind.'
05
TGF-β is the tumor-secreted 'all-purpose immunosuppressant,' simultaneously suppressing NK cells, T cells, and dendritic cells. An important in-research treatment target.
06
Every evasion mechanism = a treatment target. The future of immunotherapy lies in combination strategies simultaneously blocking multiple escape pathways.
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