PMID: 8591656Nov 1, 1995Paper

Innovative treatment approaches for rheumatoid arthritis. Issues in clinical trials of biological agents

Baillière's Clinical Rheumatology
V Strand

Abstract

Biological agents have pointed out directions for future research, although none yet are therapies to be employed in the clinic. To date we have administered them at pharmacological; even industrial-strength doses, without demonstrating the desired cell- or diseased-specific effects. There are many issues specific to the clinical development of biological agents which distinguish them from pharmaceutical products. Most are immunologically active; early trials are performed in patients with disease, rather than normal volunteers. This poses multiple challenges: access to an appropriate patient population, as well as effecting immunomodulation without interfering with normal immune surveillance. Species-specificity of the agent may limit the use of preclinical animal models, and the duration of toxicology studies. Immunogenicity may preclude regular re-administration, necessitating prolonged benefit after single or limited treatment courses. Parenteral administration requires more careful monitoring, limits access to the agent, is associated with more expense, and may contribute to the high observed placebo response following treatment with biological agents. Requirements, and our expectations, for clinical benefit are therefore ...Continue Reading

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