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Although a few are cytotoxic, most of the agents under this category are biologic
response modifiers that alter the host response to cancer. A major goal of biologic
therapy is to manipulate the host immune response to cancer. Most of biologic therapies
still remain investigational. Despite the considerable growth during the past decade in
basic knowledge about the mechanisms of host resistance and the immune response, biologic
therapy has not yet become the fourth major modality for cancer treatment after surgery,
radiotherapy and chemotherapy. The various strategies currently being used include:
Immunotherapy
* Tumor vaccines Hemopoietic growth factors |