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Immunotherapy is a type of cancer treatment that uses the body's immune system to fight cancer. The immune system is responsible for protecting the body from harmful substances, such as viruses, bacteria, and cancer cells. However, cancer cells can sometimes evade detection or suppression by the immune system.

Immunotherapy works by enhancing the body’s natural defenses or by providing artificial means (such as engineered immune cells) to attack cancer cells more effectively. There are several types of immunotherapy, including:

1. Monoclonal Antibodies: These are laboratory-made molecules that can mimic the immune system’s ability to fight cancer. Some monoclonal antibodies are designed to target specific cancer cell proteins, while others can help the immune system recognize and destroy cancer cells.

2. Checkpoint Inhibitors: These drugs block checkpoints, which are signals that prevent immune cells from attacking cancer cells. By inhibiting these checkpoints, the immune system can recognize and destroy cancer cells more effectively. Examples include PD-1 and PD-L1 inhibitors (e.g., pembrolizumab, nivolumab) and CTLA-4 inhibitors (e.g., ipilimumab).

3. Cancer Vaccines: These vaccines aim to stimulate the immune system to target cancer cells. Unlike vaccines for viruses, cancer vaccines are designed to prevent cancer from developing or to treat existing cancers. The most well-known example is the HPV vaccine, which helps prevent cervical and other cancers caused by the human papillomavirus.

4. Adoptive Cell Transfer (ACT): This approach involves collecting immune cells (often T cells) from a patient, modifying them to better target cancer cells, and then infusing them back into the patient. A well-known form of ACT is CAR-T cell therapy, where T cells are genetically engineered to express a receptor specific to cancer cells.

5. Cytokine Therapy: Cytokines are proteins that help regulate the immune system. Some cytokines can be used in cancer treatment to boost the immune response. Examples include interleukins and interferons.

Immunotherapy has shown great promise in treating several cancers, including melanoma, lung cancer, and certain types of lymphoma and leukemia. However, not all patients respond to immunotherapy, and it can come with side effects, as the immune system might attack normal healthy tissues.