Cold Tumors vs Hot Tumors: Why Immunotherapy Works for Some Cancers but Not Others

By Editorial Team

One of the most important concepts in modern oncology is understanding why some tumors respond dramatically to immunotherapy while others remain resistant.

The answer often comes down to whether a tumor is "hot" or "cold."

What Is a Hot Tumor?

Hot tumors contain:

  • Large numbers of immune cells

  • Activated T-cells

  • High inflammatory activity

The immune system already recognizes these tumors but may be blocked by checkpoint proteins.

Examples:

  • Melanoma

  • MSI-H colorectal cancer

  • Hodgkin lymphoma

What Is a Cold Tumor?

Cold tumors have:

  • Few immune cells

  • Weak immune recognition

  • Limited inflammation

Examples:

  • Pancreatic cancer

  • Glioblastoma

  • Certain prostate cancers

Why Cold Tumors Resist Treatment

Cold tumors often:

  • Hide from immune surveillance

  • Exclude T-cells

  • Create immunosuppressive environments

As a result, checkpoint inhibitors may have little effect.

Can Cold Tumors Become Hot?

Researchers are actively exploring methods to convert cold tumors into hot tumors.

Potential strategies include:

  • Radiation therapy

  • Cancer vaccines

  • Oncolytic viruses

  • Metabolic therapy

  • Targeted therapies

  • Combination immunotherapy

The Future

The next frontier in immunotherapy may not be developing stronger drugs but transforming cold tumors into immune-responsive tumors.

Key Takeaway

The hot-versus-cold tumor concept helps explain why some patients achieve long-lasting remissions while others experience limited benefit from immunotherapy.


References

  1. OneDayMD: Latest Breakthroughs in Cancer Treatment

  2. How to Read a Cancer Study Without Being Misled (2026 Guide)

  3. Why Some Patients Respond Miraculously to Immunotherapy

  4. PD-L1 Explained for Patients: What Your Biomarker Test Really Means

  5. Gastric Cancer and the Immunotherapy Revolution: How Checkpoint Inhibitors Are Changing Survival Outcomes

  6. Tumor Mutation Burden (TMB) Explained: Who Responds Best to Immunotherapy?

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