Volume 31, Issue 3 pp. 405-415
REVIEW

Assessing cognitive toxicity in early phase trials - What are we missing?

Sarah E. Stapleton

Corresponding Author

Sarah E. Stapleton

Royal Marsden Hospital Drug Development Unit, Sutton, UK

University of Southampton, Southampton, UK

Correspondence

Sarah E. Stapleton, Drug Development Unit Royal Marsden Hospital Downs Rd Sutton Surrey SM2 5PT, Sutton, UK.

Email: [email protected]

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Anne-Sophie Darlington

Anne-Sophie Darlington

University of Southampton, Southampton, UK

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Anna Minchom

Anna Minchom

Royal Marsden Hospital Drug Development Unit, Sutton, UK

Institute of Cancer Research, Sutton, UK

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Abhijit Pal

Abhijit Pal

Royal Marsden Hospital Drug Development Unit, Sutton, UK

Institute of Cancer Research, Sutton, UK

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Florence Raynaud

Florence Raynaud

Royal Marsden Hospital Drug Development Unit, Sutton, UK

Institute of Cancer Research, Sutton, UK

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Theresa Wiseman

Theresa Wiseman

Royal Marsden Hospital, Sutton, UK

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First published: 14 October 2021

Abstract

Objectives

Novel therapies, such as, small protein molecule inhibitors and immunotherapies are first tested clinically in Phase I trials. Moving on to later phase trials and ultimately standard practice. A key aim of these early clinical trials is to define a toxicity profile; however, the emphasis is often on safety. The concern is cognitive toxicity is poorly studied in this context and may be under-reported. The aim of this review is to map evidence of cognitive assessment, toxicity, and confounding factors within reports from Phase I trials and consider putative mechanisms of impairment aligned with mechanisms of novel therapies.

Methods

A scoping review methodology was applied to the search of databases, including Embase, MEDLINE, Clinicaltrials.gov. A [keyword search was conducted, results screened for duplication then inclusion/exclusion criteria applied. Articles were further screened for relevance; data organised into categories and charted in a tabular format]. Evidence was collated and summarised into a narrative synthesis.

Results

Despite the availability of robust ways to assess cognitive function, these are not routinely included in the conduct of early clinical trials. Reports of cognitive toxicity in early Phase I trials are limited and available evidence on this shows that a proportion of patients experience impaired cognitive function over the course of participating in a Phase I trial. Links are identified between the targeted action of some novel therapies and putative mechanisms of cognitive impairment.

Conclusion

The review provides rationale for research investigating cognitive function in this context. A study exploring the cognitive function of patients on Phase I trials and the feasibility of formally assessing this within early clinical trials is currently underway at the Royal Marsden.

CONFLICT OF INTEREST

The authors who are listed here certify that they have no conflict of interest to report relating to the subject matter discussed in this manuscript.

DATA AVAILABILITY STATEMENT

Data sharing is not applicable to this article as no new data were created or analysed in this study.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.