:: Breast Cancer Treatment: Biological Therapy
Your own immune system is the body's natural defense mechanism against diseases, including cancers. Biological therapy exploits the immune system's natural defense substances to repair, stimulate or increase your's body's natural ability to fight cancer, either by using the natural substances themselves or by using newly developed substances that can imitate or stimulate the natural defenses of the body.

NCI: Biological Therapy
Very good patient-oriented resource explaining biological therapies, from the National Cancer Institute (NCI). See also their related Biological Therapies: Using the Immune System To Treat Cancer factsheet.

Biological Therapy
Very good overview: What is biological therapy? How does biological therapy work? What are examples of biological therapies? What are the side effects of biological therapy? From the MedicineNet Breast Cancer Center.

Immunotherapy Cancer Treatment
Good overview of immunotherapy, also known as biological therapy, or biotherapy, with coverage of interferons and other cytokines, monoclonal antibodies, and cancer vaccines. From Breast Cancer Supportive Care.

Monoclonal Antibody Therapy (Passive Immunotherapy)
Discussion of monoclonal antibody therapy, considered a passive form of biological / immunotherapy because the antibodies are laboratory produced, outside the body, rather than by the immune system. Since this does not require the immune system to take an "active" anticancer role, it can be effective even if the immune system is weakened. From the American Cancer Society (ACS).

The New Targeted Biological Therapies
This article covers gene therapy, monoclonal antibodies, vaccines and immunotherapy, and nnti-angiogenesis factors. Excerpted from the book by Musa Mayer, Advanced Breast Cancer: A Guide to Living with Metastatic Disease, by the Patient-Centered Gudies: Breast Cancer Center.