Last update August 2025

Immunotherapy vs Chemotherapy

I’m considering different treatment options for cancer. How do immunotherapy and chemotherapy compare in terms of effectiveness, side effects, and long-term outcomes?

Answered by

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Lisa Miller, Patient Advocate

Immunotherapy vs Chemotherapy: The Key Differences?

When exploring cancer treatment, many people compare immunotherapy vs chemotherapy. Both can be effective, but they work in very different ways, with unique benefits, side effects, and long-term outcomes.

Understanding these differences can help you feel more informed when discussing options with your care team.

What is Immunotherapy?

Immunotherapy is the process of activating the body’s immune system to recognize and destroy cancer cells, sometimes providing lasting protection against recurrence.

What is Chemotherapy?

Chemotherapy uses drugs to directly kill rapidly dividing cells. While effective, it also affects healthy cells.

How Effective Is Immunotherapy vs Chemotherapy?

  • Immunotherapy – Often effective in cancers such as melanoma and lung cancer. Some patients experience long-lasting remission, especially when immunotherapy is combined with other treatments.
  • Chemotherapy – A proven and widely used treatment for many cancer types. It can shrink tumors, improve survival, and is frequently combined with surgery or radiation.

What Are The Side Effects of Immunotherapy vs Chemotherapy?

Immunotherapy may cause fatigue, skin irritation, or autoimmune reactions. Side effects can be unpredictable and sometimes continue after treatment.

Chemotherapy common effects include nausea, hair loss, and low blood counts. These are usually temporary and occur during treatment.

How Do You Choose Between Immunotherapy and Chemotherapy?

The best treatment depends on several factors:

  • Cancer type and stage
  • Biomarker testing results Overall health and treatment goals

Your oncologist can guide whether immunotherapy, chemotherapy, or a combination of both is the most appropriate option for your care.

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