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This page discusses the use of biologic therapy for the treatment of colorectal cancer. For a thorough review of biologic therapy for cancer treatment, please see the biologic therapy treatment monograph .
Biologic therapy, also called immunotherapy, is a treatment that uses drugs to improve the way your body’s immune system fights disease. Your immune system is your body’s natural defense against disease. A healthy and strong immune system can detect the difference between healthy cells and cancer cells. Biologic therapy attempts to repair, stimulate, or enhance the immune system so that it can fight the cancer more effectively. These therapies can be used to fight cancer or to lessen the side effects that may be caused by some cancer treatments.
The most common types of biologic therapy used for the treatment of colorectal cancer are:
Nonspecific immunomodulating agents are substances that stimulate or indirectly augment the immune system. Often, these agents target key immune system cells and cause secondary responses such as increased production of cytokines (substances produced by cells of the immune system that affect immune response) and immunoglobulins (proteins that act as an antibody).
One type of nonspecific immunomodulator that is used in the treatment of colon cancer is levamisole. Levamisole is used along with fluorouracil (5–FU) chemotherapy in the treatment of Stage III (Dukes' C) colon cancer following surgery . Levamisole may act to restore depressed immune function. Levamisole is not as commonly used today because of its toxicity to the kidneys.
Side effects of levamisole include the following:
Interleukins are cytokines that occur naturally in the body and can be made in the laboratory. Many interleukins have been identified; interleukin–2 (IL–2 or aldesleukin) has been the most widely studied in cancer treatment. IL–2 stimulates the growth and activity of many immune cells, such as lymphocytes, that can destroy cancer cells. Researchers continue to study the effects of interleukins for the treatment of various cancers, including colorectal cancer.
Side effects of interleukin-2 include the following:
Research continues on the effectiveness of immunotherapy in general, and nonspecific immunomodulating agents and interleukins specifically for treatment of colorectal cancer. At this time, these therapies are generally used in conjunction with other forms of treatment such as surgery, chemotherapy, and radiation.
For more information on biologic therapies including how to manage side effects, see the biologic therapy treatment monograph.
Last reviewed February 2003 by Jondavid Pollock, MD, PhD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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