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Cancer Immune Evasion Mechanisms

How tumors escape immune surveillance and resist immunotherapy

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Onkoloji department. Book Appointment →

What is Cancer Immune Evasion Mechanisms?

Cancer immune evasion is a hallmark of malignancy by which tumors avoid recognition or destruction by the immune system. Mechanisms include downregulation of MHC class I and antigen presentation, expression of inhibitory checkpoints (PD-L1, CTLA-4 ligands), and recruitment of suppressive cells.

The tumor microenvironment is shaped by regulatory T cells, myeloid-derived suppressor cells, tumor-associated macrophages, immunosuppressive cytokines (TGF-beta, IL-10), and metabolic alterations (hypoxia, adenosine, tryptophan catabolism). Together they create a setting hostile to anti-tumor immunity.

Resistance to immunotherapy may be primary (no response) or acquired (initial response then progression). Mechanisms include loss of antigen presentation, alternative checkpoint expression, T-cell exclusion, and clonal evolution. Combination strategies aim to overcome these resistances.

Symptoms

Manifests clinically as treatment resistance
Studied through tumor and blood immune profiling
Detected via gene expression and immunohistochemistry
Drives need for combination immunotherapy approaches
Not a symptom in itself, but a biological mechanism

Risk Factors

Tumor types with low neoantigen load
Immunologically 'cold' tumors with T-cell exclusion
Specific oncogenic pathways promoting immune escape
Prior treatment selecting resistant clones

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • When immunotherapy fails or progresses
  • When considering combination immunotherapy approaches
  • When clinical trial enrollment is being explored
  • When biomarker-guided strategy is needed

Treatment Methods

01
Combination immune checkpoint inhibition (PD-1 plus CTLA-4)
02
Combinations with chemotherapy, radiation, or targeted therapy
03
Cell therapies (CAR-T, TIL) for selected indications
04
Vaccines and oncolytic viruses to enhance antigen presentation
05
Targeting of microenvironment (TGF-beta, adenosine pathways)
06
Bispecific antibodies and engineered T-cell engagers
07
Clinical trials of novel immunomodulators

Which Department to Visit?

You can visit our Onkoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.