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Table 1 Approval Indications for IFNs<br />

FDA Approved Clinical Trials<br />

IFN-α Chronic hepatitis HIV infection<br />

Kaposi's sarcoma Colon tumors<br />

Genital warts (papillomavirus) Kidney tumors<br />

Bladder cancer<br />

Hairy cell leukemia Malignant melanoma<br />

Non-Hodgkin's lymphoma<br />

Chronic myelogenous leukemia<br />

Throat wartz (papillomavirus)<br />

IFN-β Relapsing remitting multiple sclerosis Basal cell carcinoma<br />

IFN-γ Chronic granulomatous disease Kidney tumors<br />

Leishmaniasis<br />

cannot be given orally. For many of the clinical indications, treatments of many months are needed<br />

requiring repeat injections.<br />

Page 437<br />

These drawbacks, coupled with the market value of IFN-related treatments, now and in the future, have<br />

created an interest in producing second-generation molecules that can mimic IFN activity. These<br />

“mimetics” could potentially have greater specificity with fewer side effects. They may also have the<br />

advantages of reduced manufacturing costs and more versatile delivery. The design of mimetics can be<br />

achieved through structure-<strong>based</strong> drug design methodologies that are currently being developed.<br />

However, in order to apply structure-<strong>based</strong> drug design to a protein, a solid understanding of the<br />

structure/function relationship is needed. A three-dimensional structure, taken alone, gives little insight<br />

into the activity of a protein. <strong>Structure</strong>/function studies must be done for the full potential of structure<strong>based</strong><br />

drug design to be realized.<br />

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