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Abstract
In search of new strategies for the treatment of cancer, the interaction between tumor and stroma attracts more and more attention. Disruption of stroma functions, e.g. angiogenesis, has evolved into a promising target for cancer therapies. Since stromal cells are genetically stable, stroma-targeted therapies seem to be less susceptible to the development of drug resistance. Several well-established drugs, which had initially been developed for other indications, also exhibit antitumor activity. Among those, PPARγ agonists, COX-2 inhibitors, and mTOR antagonists are the most remarkable examples. Current research data and clinical experience suggest that these drugs target stroma functions in cancer, in particular angiogenesis, but immunological mechanisms and direct antitumor effects seem to participate as well. In addition to these drugs, frequent administration of low-dose chemotherapeutics, referred to as metronomic chemotherapy, reveals profound anti-angiogenic effects. In the meantime, a multitude of preclinical and clinical studies have been undertaken, which demonstrate the efficacy of these drugs in cancer therapy. Combinatorial use of these agents has been suggested to be superior in terms of antitumor efficacy and prevention of drug resistance. The toxicity of these therapies is surprisingly low compared with conventional high-dose chemotherapy regimens. Patients with advanced disease, often heavily pretreated and presenting multiple drug resistance, could particularly profit from such tumor-stroma-targeted therapies. However, larger randomized clinical trials are required for further evaluation and optimization of this concept.
Keywords: tumor-stroma interaction, stroma-targeted therapy, cox, mtor, rapamycin, metronomic chemotherapy, tumor angiogenesis, antiangiogenic
Current Cancer Drug Targets
Title: New Indications for Established Drugs: Combined Tumor-Stroma-Targeted Cancer Therapy with PPARγ Agonists, COX-2 Inhibitors, mTOR Antagonists and Metronomic Chemotherapy
Volume: 5 Issue: 6
Author(s): Christian Hafner, Albrecht Reichle and Thomas Vogt
Affiliation:
Keywords: tumor-stroma interaction, stroma-targeted therapy, cox, mtor, rapamycin, metronomic chemotherapy, tumor angiogenesis, antiangiogenic
Abstract: In search of new strategies for the treatment of cancer, the interaction between tumor and stroma attracts more and more attention. Disruption of stroma functions, e.g. angiogenesis, has evolved into a promising target for cancer therapies. Since stromal cells are genetically stable, stroma-targeted therapies seem to be less susceptible to the development of drug resistance. Several well-established drugs, which had initially been developed for other indications, also exhibit antitumor activity. Among those, PPARγ agonists, COX-2 inhibitors, and mTOR antagonists are the most remarkable examples. Current research data and clinical experience suggest that these drugs target stroma functions in cancer, in particular angiogenesis, but immunological mechanisms and direct antitumor effects seem to participate as well. In addition to these drugs, frequent administration of low-dose chemotherapeutics, referred to as metronomic chemotherapy, reveals profound anti-angiogenic effects. In the meantime, a multitude of preclinical and clinical studies have been undertaken, which demonstrate the efficacy of these drugs in cancer therapy. Combinatorial use of these agents has been suggested to be superior in terms of antitumor efficacy and prevention of drug resistance. The toxicity of these therapies is surprisingly low compared with conventional high-dose chemotherapy regimens. Patients with advanced disease, often heavily pretreated and presenting multiple drug resistance, could particularly profit from such tumor-stroma-targeted therapies. However, larger randomized clinical trials are required for further evaluation and optimization of this concept.
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Hafner Christian, Reichle Albrecht and Vogt Thomas, New Indications for Established Drugs: Combined Tumor-Stroma-Targeted Cancer Therapy with PPARγ Agonists, COX-2 Inhibitors, mTOR Antagonists and Metronomic Chemotherapy, Current Cancer Drug Targets 2005; 5 (6) . https://dx.doi.org/10.2174/1568009054863591
DOI https://dx.doi.org/10.2174/1568009054863591 |
Print ISSN 1568-0096 |
Publisher Name Bentham Science Publisher |
Online ISSN 1873-5576 |
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