Immunotherapy has changed how cancer is treated. Instead of directly attacking cancer cells like chemotherapy or radiation, immunotherapy helps the body’s own immune system recognize and fight cancer more effectively. While it is not suitable for every patient or cancer type, its success has brought new hope to many.

What Is Immunotherapy and How Does It Work?

Immunotherapy uses medicines that strengthen or modify the immune system so it can detect and destroy cancer cells.
Cancer often hides by switching off immune responses. Immunotherapy removes these “brakes,” allowing immune cells to attack tumors.

Common types include immune checkpoint inhibitors, targeted immune therapies, cancer vaccines, and CAR-T cell therapy.

Success Rates Vary by Cancer Type

Immunotherapy does not work the same for all cancers. Success depends on cancer type, stage, and individual biology.

• Melanoma: Long-term survival has improved significantly, with response rates around 40–50% in advanced cases.

• Lung cancer: Certain patients with advanced non-small cell lung cancer show response rates of 20–30%, with longer survival than chemotherapy alone.

• Kidney and bladder cancer: Many patients experience durable responses lasting years.

• Blood cancers: CAR-T therapy has shown remission rates above 60–80% in specific leukemias and lymphomas.

These results represent major progress compared to older treatments.

Why Some Patients Respond Better Than Others

Not all patients benefit equally from immunotherapy. Key factors include:

• Presence of biomarkers like PD-L1

• Tumor mutation burden

• Overall immune health

• Cancer stage and spread

Doctors often perform biomarker testing before starting immunotherapy to identify patients most likely to respond.

Long-Term Benefits and Durability of Response

One of the biggest advantages of immunotherapy is durability.
Some patients remain cancer-free for years after treatment stops. This was rare with traditional therapies.

However, responses can take time. Unlike chemotherapy, immunotherapy may show delayed effects, and in some cases, tumors appear to grow before shrinking.

Limitations and Side Effects to Understand

While immunotherapy is generally better tolerated than chemotherapy, it can cause immune-related side effects such as:

• Skin rashes

• Fatigue

• Thyroid dysfunction

• Inflammation of lungs, liver, or intestines

These side effects are usually manageable when detected early, which is why close monitoring is essential.

Immunotherapy has improved survival rates in several cancers and transformed treatment outcomes for many patients. While it is not a universal cure, its success rates continue to rise as research advances.

The best results come from personalized treatment planning guided by oncologists, biomarker testing, and careful follow-up.