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The Association Between Cancer and Dementia : A National Cohort Study in Sweden

Sun, Ming LU ; Wang, Youxin ; Sundquist, Jan LU ; Sundquist, Kristina LU and Ji, Jianguang LU orcid (2020) In Frontiers in Oncology 10.
Abstract

Background: Previous studies have found that the incidence of dementia is lower in patients with cancer. However, the impact of survival bias, as well as the confounding by medical treatment, have not been fully addressed. We aimed to explore the subsequent risk of dementia in different follow-up intervals among patients with cancer, as well as the risk before the diagnosis of cancer. Methods: By using the Swedish Cancer Register and the Swedish Hospital Discharge Register, we systematically examined the risk of dementia among patients diagnosed with 35 different types of cancer. Standardized incidence ratios (SIRs) were used to calculate the relative risk. Results: The subsequent risk of dementia in patients with cancer decreased by... (More)

Background: Previous studies have found that the incidence of dementia is lower in patients with cancer. However, the impact of survival bias, as well as the confounding by medical treatment, have not been fully addressed. We aimed to explore the subsequent risk of dementia in different follow-up intervals among patients with cancer, as well as the risk before the diagnosis of cancer. Methods: By using the Swedish Cancer Register and the Swedish Hospital Discharge Register, we systematically examined the risk of dementia among patients diagnosed with 35 different types of cancer. Standardized incidence ratios (SIRs) were used to calculate the relative risk. Results: The subsequent risk of dementia in patients with cancer decreased by 21% compared to matched cancer-free controls (SIR = 0.79, 95% CI 0.78–0.80). For specific cancer sites, 21 of them had a significantly lower risk of subsequent dementia. The decreased risk of dementia was also significant before the diagnosis of cancer. However, the risk was higher among patients with cancer who survived for more than 10 years' post-diagnosis (SIR = 1.37, 95% CI 1.32–1.41). Conclusions: In this population-based study, we found that the risk of dementia was lower among patients with cancer, and the risk was also lower before the diagnosis of cancer. This suggests that lower dementia risk is not simply due to bias. However, the underlying mechanisms need to be explored further.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cancer, dementia, incidence, inverse association, nationwide
in
Frontiers in Oncology
volume
10
article number
73
publisher
Frontiers Media S. A.
external identifiers
  • pmid:32117730
  • scopus:85079594544
ISSN
2234-943X
DOI
10.3389/fonc.2020.00073
language
English
LU publication?
yes
id
3bea6d24-0bee-4d4d-a8db-d0a1c09a96f9
date added to LUP
2020-03-10 15:23:44
date last changed
2024-04-17 05:29:25
@article{3bea6d24-0bee-4d4d-a8db-d0a1c09a96f9,
  abstract     = {{<p>Background: Previous studies have found that the incidence of dementia is lower in patients with cancer. However, the impact of survival bias, as well as the confounding by medical treatment, have not been fully addressed. We aimed to explore the subsequent risk of dementia in different follow-up intervals among patients with cancer, as well as the risk before the diagnosis of cancer. Methods: By using the Swedish Cancer Register and the Swedish Hospital Discharge Register, we systematically examined the risk of dementia among patients diagnosed with 35 different types of cancer. Standardized incidence ratios (SIRs) were used to calculate the relative risk. Results: The subsequent risk of dementia in patients with cancer decreased by 21% compared to matched cancer-free controls (SIR = 0.79, 95% CI 0.78–0.80). For specific cancer sites, 21 of them had a significantly lower risk of subsequent dementia. The decreased risk of dementia was also significant before the diagnosis of cancer. However, the risk was higher among patients with cancer who survived for more than 10 years' post-diagnosis (SIR = 1.37, 95% CI 1.32–1.41). Conclusions: In this population-based study, we found that the risk of dementia was lower among patients with cancer, and the risk was also lower before the diagnosis of cancer. This suggests that lower dementia risk is not simply due to bias. However, the underlying mechanisms need to be explored further.</p>}},
  author       = {{Sun, Ming and Wang, Youxin and Sundquist, Jan and Sundquist, Kristina and Ji, Jianguang}},
  issn         = {{2234-943X}},
  keywords     = {{cancer; dementia; incidence; inverse association; nationwide}},
  language     = {{eng}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Oncology}},
  title        = {{The Association Between Cancer and Dementia : A National Cohort Study in Sweden}},
  url          = {{http://dx.doi.org/10.3389/fonc.2020.00073}},
  doi          = {{10.3389/fonc.2020.00073}},
  volume       = {{10}},
  year         = {{2020}},
}