Immunotherapy, a rapidly evolving area in cancer research, is yet another option for the treatment of certain types of cancers. For example, the immune system identifies tumor cells as being foreign and thus they are targeted for destruction by the immune system. Unfortunately, the response typically is not sufficient to prevent most tumor growths. However, recently there has been a focus in the area of immunotherapy to develop methods that augment or supplement the natural defense mechanism of the immune system. Examples of immunotherapies currently under investigation or in use are immune adjuvants ( ., Mycobacterium bovis, Plasmodium falciparum , dinitrochlorobenzene and aromatic compounds) ( . Patent 5,801,005 ; . Patent 5,739,169 ; Hui and Hashimoto, 1998; Christodoulides et al., 1998), cytokine therapy ( ., interferons α, β and γ; IL-1, GM-CSF and TNF) (Bukowski et al., 1998; Davidson et al., 1998; Hellstrand et al., 1998) gene therapy ( ., TNF, IL-1, IL-2, p53) (Qin et al., 1998; Austin-Ward and Villaseca, 1998; . Patent 5,830,880 and . Patent 5,846,945 ) and monoclonal antibodies ( ., anti-ganglioside GM2, anti-HER-2, anti-p185) (Pietras et al., 1998; Hanibuchi et al., 1998; . Patent 5,824,311 ).