Several years ago, when the discovery of catalytic RNA was recognized in a public manner,many people asked if new ?elds of therapy would soon be available. Although some tentative positive answers were given,nobody would say with certainty that RNA of various kinds was a truly promising means of altering gene expression. In fact,over the past decade,both our knowledge of RNAs with different functions and the utility of RNA in the inhibition or enhancement of gene expression have occurred with great drama. We proceeded in terms of possible therapeutic tools from RNase P and group I introns through "hammerhead" RNA enzymes, antisense technology, and more recently, to RNAi and its derivatives. A useful practical method of RNA delivery in animals will complete the picture. The diversity of RNA and the varied role of it inside cells and in therapy should be a tremendous challenge for young molecular biologists. This volume will make their task easier. Sidney Altman Sterling Professor of Molecular,Cellular & Devel- mental Biology,Nobel Laureate Department of Molecular,Cellular and Developm- tal Biology Yale University V NGTPR 4/23/05 1:00 PM Page VI VI Foreword Delivery of nucleic acids to cells in an animal remains a challenging problem. It is the major obstacle to success of therapeutic approaches using genes and oli- nucleotides,including siRNAs. Solutions found so far by chemists are satisfactory only for transfection of cells in culture.

Proceedings of the International Symposium on Polymer Therapeutics - Recent Progress in Clinics and Future Prospects, held July 13-14, 2001, in Nara, Japan. The technology of polymer science has developed considerably during the past half-century, and this volume describes some of the aspects of this technology that will have a great impact in the future. Among these advances, for example, are gene delivery to specific disease sites and carrier polymers that respond to a stimulus or particular environment. Cancer targeted drug delivery is another focused area of this volume because of the important nature of EPR-effect of polymer drugs in tumor. Included are discussions of as many examples as possible of polymer drugs that have achieved, or are close to clinical use. The concept of "Polymer drugs" here is limited to primarily injectable and water-soluble agents, although also covered are some drugs in micellar form or liposomes. This book is intended for students and researchers in the field of pharmacology who have particular interests in drug delivery, targeting, and formulation, as well as for clinicians such as oncologists who are interested in the field. People who work at regulatory agencies should also be aware such that drugs with great potential are being developed and will be beneficial to many patients, as well as to health insurance agencies because of improved cost effectiveness.

Several years ago, when the discovery of catalytic RNA was recognized in a public manner,many people asked if new ?elds of therapy would soon be available. Although some tentative positive answers were given,nobody would say with certainty that RNA of various kinds was a truly promising means of altering gene expression. In fact,over the past decade,both our knowledge of RNAs with different functions and the utility of RNA in the inhibition or enhancement of gene expression have occurred with great drama. We proceeded in terms of possible therapeutic tools from RNase P and group I introns through "hammerhead" RNA enzymes, antisense technology, and more recently, to RNAi and its derivatives. A useful practical method of RNA delivery in animals will complete the picture. The diversity of RNA and the varied role of it inside cells and in therapy should be a tremendous challenge for young molecular biologists. This volume will make their task easier. Sidney Altman Sterling Professor of Molecular,Cellular & Devel- mental Biology,Nobel Laureate Department of Molecular,Cellular and Developm- tal Biology Yale University V NGTPR 4/23/05 1:00 PM Page VI VI Foreword Delivery of nucleic acids to cells in an animal remains a challenging problem. It is the major obstacle to success of therapeutic approaches using genes and oli- nucleotides,including siRNAs. Solutions found so far by chemists are satisfactory only for transfection of cells in culture.

Proceedings of the International Symposium on Polymer Therapeutics - Recent Progress in Clinics and Future Prospects, held July 13-14, 2001, in Nara, Japan.

The technology of polymer science has developed considerably during the past half-century, and this volume describes some of the aspects of this technology that will have a great impact in the future. Among these advances, for example, are gene delivery to specific disease sites and carrier polymers that respond to a stimulus or particular environment. Cancer targeted drug delivery is another focused area of this volume because of the important nature of EPR-effect of polymer drugs in tumor. Included are discussions of as many examples as possible of polymer drugs that have achieved, or are close to clinical use. The concept of "Polymer drugs" here is limited to primarily injectable and water-soluble agents, although also covered are some drugs in micellar form or liposomes.

This book is intended for students and researchers in the field of pharmacology who have particular interests in drug delivery, targeting, and formulation, as well as for clinicians such as oncologists who are interested in the field. People who work at regulatory agencies should also be aware such that drugs with great potential are being developed and will be beneficial to many patients, as well as to health insurance agencies because of improved cost effectiveness.