Research on antiviral drugs and their mode of action in infected cells. in animals and in man. has led to a better understanding of the molecular pro cesses involved in virus replication. Screeninq of large numbers of natural and semisynthetic compounds resulted in the characterization of certain sub stances that had a limited efficiency as antiviral druqs. A few chemically synthesized compounds were also found to be effective as antiviral agents in the chemotherapy of human virus diseases. A major difficulty in the develop ment of effective antiviral agents has been the lack of selectivity. and toxicity for uninfected cells. of drugs that effectively inhibited virus replication in vitro. Further understanding of the molecular processes of virus replication in infected cells has resulted in the development of new antivirals directed at virus-coded enzymes or proteins. Recent studies on antivirals that are activated by the herpes simplex virus type l-coded thy midine kinase from a prod rug to an antiviral drug have opened new directions in the development of effective antiviral drugs. The present book deals with a number of antiviral drugs effective against herpes simplex viruses and provides some insight into the molecular aspects of virus replication. It also throws light on the new approaches to the development of antiviral drugs. The molecular basis of the antiviral activity of new and known drugs and their possible use in chemotherapy of viral disease are presented in this book.

Interferons were among the first cytokines to be studied clinically in recombinant form in the 1980s, beginning a new era of pharmacotherapy in internal medicine. Interferons were soon employed in the treatment of tumors and it was shown that those hematopoietic neoplasias which had been difficult to treat with chemotherapy responded well to interferon treatment. In the present volume, renowned international authors update the importance of interferons in various fields of internal medicine, dermatology, and urology. The book also contains a general introduction into the classification, structure, and mode of action of interferons. Further chapters discuss the range of side effects of these substances and point out possible focuses of further clinical interferon research.

This book is an update of Interferon, published in 1969 by Dr. Jan Vilcek. The field of interferon research has since expanded from its former narrow treatment of interferon strictly as an antiviral substance, such that The Interferon System now encompasses cellular modulations ranging from immune alterations to cell proliferative restrictions to antitumor activities. The steadily increasing number of these non-antiviral functions of interferons emphasizes the need for a comprehensive - and critical - review of the entire literature of interferon studies. The text, with its supporting bibliography, provides complete coverage of interferon research. A newcomer to the area should find here all the informa tion necessary to understand why interferon, which has been studied for more than twenty years and which originally stirred excitement over its clinical pros pects, is still inspiring speculation about this potential. For those already fa miliar with the seemingly perpetual clinical promise of interferon, this volume should serve as a valuable reference source, the largest bibliography on the subject ever to appear under one cover. Clearly, this book should be considered only as an introduction to the topic and as a reference source; most questions about the interferon system are still unanswered - even unasked. Hopefully this summation and critical evalua tion of work done to date will stimulate and facilitate further progress. William E. Stewart II New York, N. Y., February 1979 Contents I. Introduction ............................................................. .