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Updated: Jun 10, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
Published on: February 1, 2016
Positron emission tomography (PET) and anticancer drug development
Catharine M L West1, Terry Jones, Pat Price
1Academic Department of Radiation Oncology and Manchester Molecular Imaging Centre, The University of Manchester, Christie NHS Trust Hospital, Wilmslow Road, Manchester, M20 4BX, United Kingdom.
Abstract:
Extract: The last ten years saw a rapid increase in the number and type of new agents undergoing clinical evaluation for the treatment of cancer. Unfortunately, this expansion in drug development is associated with a high rate of attrition from success in early clinical evaluation to regulatory approval. Furthermore, a recent analysis showed that innovations around clinically validated mechanisms aimed at being best-in-class have created more value for the pharmaceutical industry than their first-in-class counterparts (i.e., some drugs similar to previous ones may work better and commercially more successful than novel drugs). These developments have stimulated research into finding methods for the early assessment of efficacy and for the demonstration of proof-of-principle (i.e., that the drug is hitting the correct target) of new agents in cancer patients. It is thought that conventional anatomical imaging methods for assessing treatment response are not only less applicable to many of the new agents, but also might contribute to the high rate of attrition of new agents during the drug development process.
Insights
Cancer drug development faces high attrition rates despite new agents. Innovations in "best-in-class" drugs show more industry value than novel "first-in-class" drugs, necessitating better early efficacy assessments.
Area of Science:
- Oncology
- Pharmaceutical Sciences
- Clinical Trials
Background:
- The last decade has seen significant growth in novel cancer drug candidates entering clinical evaluation.
- High attrition rates persist in cancer drug development, from early trials to regulatory approval.
- Industry value is increasingly derived from 'best-in-class' innovations rather than purely 'first-in-class' novel agents.
Purpose of the Study:
- To address the high attrition rate in cancer drug development.
- To explore novel methods for early assessment of drug efficacy and proof-of-principle.
- To improve the success of new anti-cancer agents through better early evaluation.
Main Methods:
- Review of recent trends in cancer drug development.
- Analysis of industry value creation from different types of drug innovation.
- Discussion of limitations of conventional anatomical imaging for assessing treatment response.
- Exploration of the need for advanced methods for early efficacy assessment.
Main Results:
- Cancer drug development expansion is coupled with a high failure rate.
- Clinically validated 'best-in-class' innovations generate more industry value than 'first-in-class' drugs.
- Conventional anatomical imaging may be inadequate for evaluating many new cancer agents and could contribute to attrition.
Conclusions:
- There is a critical need for improved early assessment methods in cancer drug development.
- Advanced techniques are required to demonstrate proof-of-principle and efficacy for novel cancer therapies.
- Rethinking response assessment strategies is crucial to reduce the high attrition rates in oncology drug development.
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