The root causes of pharmacodynamic assay failure.

Abstract:

:Robust pharmacodynamic assay results are valuable for informing go/no-go decisions about continued development of new anti-cancer agents and for identifying combinations of targeted agents, but often pharmacodynamic results are too incomplete or variable to fulfill this role. Our experience suggests that variable reagent and specimen quality are two major contributors to this problem. Minimizing all potential sources of variability in procedures for specimen collection, processing, and assay measurements is essential for meaningful comparison of pharmacodynamic biomarkers across sample time points. This is especially true in the evaluation of pre- and post-dose tumor biopsies, which suffer from high levels of tumor insufficiency due to variations in biopsy collection techniques and significant specimen heterogeneity within and across patients. Developing methods to assess heterogeneous biopsies is necessary in order to evaluate a majority of tumor biopsies collected for pharmacodynamic biomarker studies. Improved collection devices and standardization of methods are being sought in order to improve the tumor content and quality of tumor biopsies. In terms of reagent variability, we have found that stringent initial reagent qualification and quality control of R&D-grade reagents is critical to minimize lot-to-lot variability and prevent assay failures, especially for clinical pharmacodynamic questions, which often demand assay performance that meets or exceeds clinical diagnostic assay standards. Rigorous reagent specifications and use of appropriate assay quality control methodologies help to ensure consistency between assay runs, laboratories and trials to provide much needed pharmacodynamic insights into the activity of investigational agents.

journal_name

Semin Oncol

journal_title

Seminars in oncology

authors

Ferry-Galow KV,Makhlouf HR,Wilsker DF,Lawrence SM,Pfister TD,Marrero AM,Bigelow KM,Yutzy WH,Ji JJ,Butcher DO,Gouker BA,Kummar S,Chen AP,Kinders RJ,Parchment RE,Doroshow JH

doi

10.1053/j.seminoncol.2016.06.006

subject

Has Abstract

pub_date

2016-08-01 00:00:00

pages

484-91

issue

4

eissn

0093-7754

issn

1532-8708

pii

S0093-7754(16)30036-7

journal_volume

43

pub_type

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