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Four decades of chemotherapy-induced cognitive dysfunction: comprehensive review of clinical, animal and in vitro studies, and insights of key initiating events

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Abstract

Cognitive dysfunction has been one of the most reported and studied adverse effects of cancer treatment, but, for many years, it was overlooked by the medical community. Nevertheless, the medical and scientific communities have now recognized that the cognitive deficits caused by chemotherapy have a strong impact on the morbidity of cancer treated patients. In fact, chemotherapy-induced cognitive dysfunction or ‘chemobrain’  (also named also chemofog) is at present a well-recognized effect of chemotherapy that could affect up to 78% of treated patients. Nonetheless, its underlying neurotoxic mechanism is still not fully elucidated. Therefore, this work aimed to provide a comprehensive review using PubMed as a database to assess the studies published on the field and, therefore, highlight the clinical manifestations of chemobrain and the putative neurotoxicity mechanisms.

In the last two decades, a great number of papers was published on the topic, mainly with clinical observations. Chemotherapy-treated patients showed that the cognitive domains most often impaired were verbal memory, psychomotor function, visual memory, visuospatial and verbal learning, memory function and attention. Chemotherapy alters the brain’s metabolism, white and grey matter and functional connectivity of brain areas. Several mechanisms have been proposed to cause chemobrain but increase of proinflammatory cytokines with oxidative stress seem more relevant, not excluding the action on neurotransmission and cellular death or impaired hippocampal neurogenesis. The interplay between these mechanisms and susceptible factors makes the clinical management of chemobrain even more difficult. New studies, mainly referring to the underlying mechanisms of chemobrain and protective measures, are important in the future, as it is expected that chemobrain will have more clinical impact in the coming years, since the number of cancer survivors is steadily increasing.

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Abbreviations

5-FU:

5-Fluorouracil

3-NT:

3-nitrotyrosine

BBB:

Blood-brain barrier

BDNF:

Brain-derived neurotrophic factor

CNS:

Central nervous system

COX-2:

Cyclooxygenase type 2

CYA:

Cyclophosphamide

DOX:

Doxorubicin

DTI:

Diffusion-tensor imaging

EEG:

Electroencephalogram

EORTC QLQ-C30:

European organization for research and treatment of cancer quality of life questionnaire C30

ERP:

Event-related potential

fMRI:

Functional magnetic resonance imaging

GCEE:

γ-glutamyl cysteine ethyl ester

GFAP:

Glial fibrillary acidic protein

GSH:

Glutathione

HNE:

4-hydroxynonenal

HSCS:

High-sensitivity cognitive screen

iNOS:

Inducible nitric oxide synthase

MMSE:

Mini mental state examination

MRI:

Magnetic resonance imaging

MTX:

Methotrexate

NF-κB:

Nuclear factor kappa B

PET:

Positron emission tomography

RONS:

Reactive oxygen and nitrogen species

ROS:

Reactive oxygen species

TNF-α:

Tumor necrosis factor alpha

VBM:

Voxel-based morphometry

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Acknowledgements

This work is financed by national funds from FCT—Fundação para a Ciência e a Tecnologia, I.P., in the scope of the project UIDP/04378/2020 and UIDB/04378/2020 of the Research Unit on Applied Molecular Biosciences—UCIBIO and the project LA/P/0140/2020 of the Associate Laboratory Institute for Health and Bioeconomy—i4HB and through the project EXPL/MED-FAR/0203/2021. The work also received funding from the Innovative Medicines Initiative 2 Joint Undertaking under grant agreement No 821528 (NeuroDeRisk: Neurotoxicity De-Risking in Preclinical Drug Discovery). This Joint Undertaking receives support from the European Union’s Horizon 2020 research and innovation programme and the European Federation of Pharmaceutical Industries and Associations (EFPIA). A. Dias-Carvalho acknowledges FCT and UCIBIO for her PhD grant (UI/BD/151318/2021). VMC acknowledges FCT for her grant (SFRH/BD/129359/2017), being the later funded by national funds through FCT under the Norma Transitória – DL57/2016/CP1334/CT0006.

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Correspondence to Ana Dias-Carvalho or Vera Marisa Costa.

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Dias-Carvalho, A., Ferreira, M., Ferreira, R. et al. Four decades of chemotherapy-induced cognitive dysfunction: comprehensive review of clinical, animal and in vitro studies, and insights of key initiating events. Arch Toxicol 96, 11–78 (2022). https://doi.org/10.1007/s00204-021-03171-4

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  • DOI: https://doi.org/10.1007/s00204-021-03171-4

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