Review
Vaccines for colorectal cancer

https://doi.org/10.1016/S1471-4914(01)01992-XGet rights and content

Abstract

Despite recent advances in the treatment of colorectal cancer, the overall survival rate for those patients with advanced locoregional disease remains less than 50%. Although adjuvant systemic chemotherapy has improved survival of these patients, more effective therapies are needed. Immunotherapy is an approach that could have a particular role in the adjuvant therapy of colorectal cancer. There is now convincing evidence that the immune system can specifically recognize and destroy malignant cells. Although both antibody- and T-cell-mediated anti-tumor responses have been documented, the cellular immune response with its direct cytotoxic mechanisms is felt to be the principal anti-tumor arm of the immune system. Analysis of the T cells that recognize tumors has led to the identification and characterization of many tumor-associated antigens including several colorectal antigens. Current approaches to developing a vaccine for colorectal cancer use our expanded understanding of these tumor-associated antigens and the conditions that allow development of an effective cellular immune response to them.

Section snippets

Advances in tumor immunology

The two most significant advances in the field of tumor immunology in the past ten years are (1) the isolation and molecular characterization of the TAAs that are recognized by T cells, and (2) the elucidation of the molecular events that lead to T-cell-activation. Our expanded understanding of the molecular structure and function of these two systems has ledtomore refined and directed cancer vaccine development.

Whole tumor cell vaccine

Until all of the TAAs for a particular cancer can be quickly isolated and characterized, many investigators believe that the best source of antigen is the tumor itself. The main advantage of this approach is that all of the antigens (unique, as well as shared) expressed by a particular cancer are presented to the immune system. However, a potential disadvantage of this technique is that the most immunologically-relevant antigens might be underexpressed on the tumor cell and thus

Antigen-specific strategies

The precise molecular identification of TAAs has allowed for the development of more refined vaccination strategies. Successful immunization to specific TAAs in pre-clinical models has been demonstrated through a variety of mechanisms (Table 3), including: (1) recombinant viral vectors 32, 33; (2) peptide vaccines 34, 35; (3) antigen loaded dendritic cell vaccines 36, 37; (4) anti-idiotypic antibody vaccination 38;(5) DNA/RNA based vaccines 39; and (6) Immunization with heat shock proteins 40.

Anti-idiotypic antibodies to colorectal TAAs

Another approach for the development of both cellular and humoral immune responses to known TAAs is the use of anti-idiotypic antibodies. Based on the network hypothesis of Lindermann 54 and Jerne 55 any epitope could be converted into idiotypic determinants expressed on antibodies. Anti-idiotypic antibodies that share sequence homologies with nominal colorectal TAA could act as functional mimics of T-cell-antigens and stimulate cellular immune responses.

The best-characterized anti-idiotypic

Conclusions

Recent advances in the field of tumor immunology have expanded our understanding of the nature of tumor-associated antigens and mechanisms of T-cell activation. It is now clearly recognized that tumor cells express antigens that can be recognized by T cells. These antigens are derived from a variety of intracellular proteins. Successful activation of T-cell response to these antigens requires that they be presented in the context of the appropriate co-stimulatory signals. Current clinical

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