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Thromb Haemost 2020; 120(04): 714-723
DOI: 10.1055/s-0040-1708484
Stroke, Systemic or Venous Thromboembolism
Georg Thieme Verlag KG Stuttgart · New York

The Effect of Chemotherapy on Stroke Risk in Cancer Patients

Takaya Kitano
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Tsutomu Sasaki
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Yasufumi Gon
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Kenichi Todo
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Shuhei Okazaki
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Tetsuhisa Kitamura
2   Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Yuri Kitamura
2   Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Manabu Sakaguchi
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Tomotaka Sobue
2   Division of Environmental Medicine and Population Sciences, Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Yasushi Matsumura
3   Department of Medical Information Science, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Satoshi Hattori
4   Department of Integrated Medicine, Biomedical Statistics, Graduate School of Medicine, Osaka University, Osaka, Japan
,
Hideki Mochizuki
1   Department of Neurology, Graduate School of Medicine, Osaka University, Osaka, Japan
› Author Affiliations Funding This study was funded by JSPS KAKENHI Grant Number 15K08915.
Further Information

Publication History

08 November 2019

06 February 2020

Publication Date:
14 April 2020 (online)

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Abstract

Background Chemotherapy may be a cause of cancer-associated stroke, but whether it increases stroke risk remains uncertain. We investigated how chemotherapy affects stroke risk in cancer patients.

Methods Of 27,932 patients in a hospital-based cancer registry (which contains clinical data on all patients treated for cancer at Osaka University Hospital) screened between 2007 and 2015, medical records of 19,006 patients with complete data were investigated. A validated algorithm was used to identify stroke events within 2 years of cancer diagnosis. Patients were divided based on whether their initial treatment plan included chemotherapy. The association between chemotherapy and stroke was analyzed using the Kaplan–Meier method and stratified Cox regression.

Results Of 19,006 patients, 5,887 (31%) were in the chemotherapy group. Stroke occurred in 44 (0.75%) and 51 (0.39%) patients in the chemotherapy and nonchemotherapy group, respectively. Kaplan–Meier curve analysis showed that patients in the chemotherapy group had a higher stroke risk than those in the nonchemotherapy group (hazard ratio [HR] 1.84; 95% confidence interval [CI] 1.23–2.75). However, this difference was insignificant after adjustment for cancer status using inverse probability of treatment weighting with propensity scores (HR 1.20; 95% CI 0.76–1.91). Similarly, in the stratified Cox regression model, chemotherapy was not associated with stroke after adjustment for cancer status (HR 1.26; 95% CI 0.78–2.03).

Conclusion In our study, the elevated stroke risk in cancer patients who received chemotherapy was presumably due to advanced cancer stage; chemotherapy was not associated with the increased risk of stroke.

Keywords

stroke - cerebral infarction - cerebrovascular disease - neoplasms - cancer

Ethical Approval

All procedures followed were in accordance with the ethical standards of the (institutional and national) committee responsible for human experimentation and with the Helsinki Declaration of 1964 and later versions, and informed consent was waived.


Supplementary Material

Comment to this article:

Chemotherapy Increases Stroke: Fact or Fiction?Thromb Haemost 2020; 120(04): 534-536
DOI: 10.1055/s-0040-1708550

 

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