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Types of Cancer Immunotherapy: Checkpoint Inhibitors, Vaccines and More
By Dr. Gajendra Kumar Himanshu
Cancer immunotherapy is a form of treatment that helps the body's immune system to better recognise and fight cancer cells. Types of cancer immunotherapy include checkpoint inhibitors, cancer vaccines, CAR-T cell therapy, monoclonal antibodies, cytokine therapy, and immune cell therapies. The best choice relies on the type of cancer, how far it has grown, its genetic features, and the general health of the patient.
In this blog, we describe the various immunotherapies, the diseases for which they are used, their benefits, probable side effects, and how doctors decide on the correct treatment for each patient.
Why Is Immunotherapy for Cancer Important?
Cancer care has progressed dramatically in the last 20 years. Immunotherapy is now one of the key options, along with surgery, chemotherapy, radiation therapy, targeted therapy and hormone therapy, for treating numerous malignancies.
Immunotherapy works by boosting or changing the body's own immune system so it can better find and battle cancer, rather than killing cancer cells directly. This strategy has led to durable responses in some individuals with advanced malignancies that previously had few therapeutic alternatives.
Immunotherapy has become an important aspect of customised cancer care for many people, although it is not suitable for every patient or illness.
What Is Cancer Immunotherapy?
The immune system is always working to protect the body from infections as well as abnormal cells. But in some cases, cancer cells evade immune surveillance by employing mechanisms that inhibit immune responses or mask themselves from immune cells.
Cancer immunotherapy is all about breaking down these barriers or boosting the immune response itself so that the body can more easily discover and kill cancer cells.
Different immunotherapy treatments function in different ways, so doctors carefully determine the best option for each patient based on their diagnosis.
The Most Common Types of Cancer Immunotherapy
Today in the treatment of cancer, several types of immunotherapy are used. Each works in a different way and is recommended for specific cancers.
Immunotherapy Type | How Does It Work | Typical Uses |
|---|---|---|
Immune checkpoint inhibitors | Take the brakes off the immune system so T cells can attack cancer. | Melanoma, lung cancer, kidney cancer, bladder cancer, head and neck malignancies, and others. |
Monoclonal antibodies | Bind to certain proteins on cancer cells or assist the immune system in recognising them. | Breast cancer, lymphoma, colorectal cancer, and several other cancers. |
T cell therapy (CAR-T) | The patient's T cells are genetically engineered to identify and destroy cancer cells. | Some blood cancers, including certain leukaemias and lymphomas. |
Cancer vaccines | Stimulate the immune system to attack cancer-associated antigens. | Some prostate malignancies and certain other clinical situations. |
Cytokine therapy | Activates immune cells with immune signalling proteins. | Selected patients with melanoma and kidney cancer. |
Checkpoint Inhibitors
Checkpoint inhibitors are among the most commonly used immunotherapy drugs today.
The immune system naturally has checkpoint proteins that prevent it from overreacting. Some cancers co-opt these checkpoints to avoid immune attack. Checkpoint inhibitor drugs work by blocking proteins like PD-1, PD-L1 or CTLA-4, thereby enabling immune cells to better find and attack cancer.
These drugs have improved results for many people with melanoma, non-small cell lung cancer, kidney cancer, bladder cancer and several other cancers.
Monoclonal Antibodies
Monoclonal antibodies are laboratory-made proteins that are designed to attach to specific targets on cancer cells.
Once linked to these targets, they can either directly interfere with cancer growth, identify cancer cells for elimination by the immune system or transport medication directly to the tumour.
Some monoclonal antibodies are classified as immunotherapy because they promote immune activity. Other monoclonal antibodies work largely through targeted treatment mechanisms.
Cancer Vaccines
Cancer vaccines are different from vaccines to prevent infectious diseases.
Preventive vaccinations, such as those against the human papillomavirus (HPV) or hepatitis B virus (HBV), decrease the chance of acquiring certain malignancies by preventing infections that might cause cancer.
Treatment vaccines are meant to boost the immune system to attack existing cancer cells. There are vaccines for some cancers, and they are still a very active area of research.
T Cell Therapy (CAR-T)
One of the most advanced forms of tailored immunotherapy is CAR-T cell therapy.
Doctors take T cells from the patient, genetically modify them in a lab to target certain cancer proteins, and then infuse the modified cells back into the bloodstream.
These engineered immune cells can better identify and kill some cancer cells. Currently, CAR-T therapy is used mainly for some blood cancers, including certain leukaemias and lymphomas.
Cytokine Therapy
Cytokines are naturally occurring proteins that let immune cells talk to each other. Some types of immunotherapy use man-made cytokines, such as interleukin-2 or interferons, to boost the immune response to cancer. Though the use of cytokine therapy has declined with the advent of newer medications, it is still relevant for certain patients.
Who Is Eligible for Immunotherapy?
Not all patients are candidates for immunotherapy. When suggesting a treatment, oncologists consider a range of factors, including:
- The type and stage of the malignancy.
- Results of biomarker testing (for example, PD-L1 expression or other genetic characteristics).
- Prior cancer treatments.
- General health and functioning of organs.
- Autoimmune illnesses or other medical issues that may interfere with immune treatment.
Specialised laboratory testing can often help evaluate if immunotherapy is likely to be helpful.
Potential Side Effects of Immunotherapy
The side effects of immunotherapy are usually due to an overreaction of the immune system, unlike chemotherapy. Potential side effects include fatigue, skin rash, itching, diarrhoea, fever, joint discomfort or infusion reactions. In some patients, the immune system attacks healthy organs such as the lungs, liver, thyroid, intestines or endocrine glands.
Why Early Identification Matters
Many immune-related side effects are manageable if identified early, emphasising the importance of prompt recognition and fast medical care. Patients should tell their oncology team if they experience any new symptoms or if existing symptoms worsen.
The Future of Immunotherapy in Cancer
Immunotherapy is a hot research topic. New checkpoint inhibitors, tailored cancer vaccines, combination strategies for immunotherapy, next-generation CAR-T therapies and medicines targeting other immune pathways are being studied by researchers.
More research may allow more patients to benefit from personalised immunotherapy approaches based on their cancer biology.
If you want to read more about cancer immunotherapy, then you can visit the official website of the National Cancer Institute.
Consult Now
If you or someone you love has been diagnosed with cancer and you are interested in finding out if immunotherapy might be a good treatment option, an important first step is to talk with an experienced oncology team. Oncare Cancer Hospital specialists will review each patient's diagnosis, biomarkers, treatment history and overall health before suggesting a tailored treatment plan that may include immunotherapy when appropriate.
Disclaimer
This material is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis or treatment. Not every patient or every malignancy is a candidate for cancer immunotherapy. Treatment decisions should always be determined by a skilled oncologist following a thorough clinical evaluation, proper diagnostic testing, and discussion of potential advantages and risks. Please consult your healthcare provider for personal medical advice.
Frequently Asked Questions
The primary types are checkpoint inhibitors, monoclonal antibodies, CAR-T cell therapy, cancer vaccines, cytokine therapy, and other immune-based treatments for certain tumours.
No. Immunotherapy works for many cancers, but it is not appropriate for all patients or all kinds of cancer. Eligibility depends on the kind of cancer, biomarkers and general clinical state.
Common side effects include fatigue, rash, loose stools, itchiness, fever and immune-related inflammation of organs such as the lungs, liver, thyroid or intestines.
To figure out if immunotherapy would likely help, doctors assess the type of cancer, how far it has grown or spread, results of biomarker testing, any past treatment, and how well the patient is doing overall.
Written and Verified by:
Dr. Gajendra Kumar Himanshu Exp: 10 Yr
Medical Officer
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