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JOURNAL ARTICLE
REVIEW
CiPA challenges and opportunities from a non-clinical, clinical and regulatory perspectives. An overview of the safety pharmacology scientific discussion.
Journal of Pharmacological and Toxicological Methods 2018 June 27
The Safety Pharmacology Society organized a scientific session at its annual conference in 2017 to discuss the challenges and opportunities of the Comprehensive In-Vitro Proarrhythmia Assay (CiPA) paradigm. Our intention was to raise awareness of this initiative with its members and also to gauge the extent to which safety pharmacologists have incorporated the CiPA testing strategy within the pharmaceutical industry. CiPA offers many potential opportunities including 1) a focus on proarrhythmic risk (as opposed to QTc prolongation), 2) providing scientific rationale to support the continued development of compounds that may have a poor selectivity over hERG whilst also blocking other inward currents and 3) reducing the extent of ECG monitoring in clinical trials with a greater influence of the non-clinical studies. Such opportunities may speed drug development and reduce costs. However, there are also challenges for CiPA implementation. For example, the mixed ion channel paradigm does not easily lend itself to a prospective drug discovery strategy although testing for such effects can be achieved with assays with good throughput. However, it should also be recognized that compounds with a mixed ion channel profile might also have properties that are undesirable to treat non-life threatening indications. All components of CiPA (nonclinical and clinical) require validation, particularly as a composite package to impact drug development and evaluation. One of the significant discussion points was that the existing regulatory guidance supports the use of components of CiPA through follow-up studies. A survey of the conference audience showed that the level of awareness of CiPA is quite high and that companies are already conducting some testing against a wider panel of cardiac ion channels beyond hERG. However, the adoption of other technologies (stem cell derived cardiac myocytes and in silico modeling) is less well developed. Taken together, the session demonstrated the potential advantages of CiPA, but also some significant challenges.
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