Impact of schizophrenia and related disorders on mortality from breast cancer: A population-based cohort study in Denmark, 1995-2011

Susanne Oksbjerg Dalton; Nis Palm Suppli; Marianne Ewertz; Niels Kroman; Luigi Grassi; Christoffer Johansen

doi:10.1016/j.breast.2018.06.002

Impact of schizophrenia and related disorders on mortality from breast cancer: A population-based cohort study in Denmark, 1995-2011

Susanne Oksbjerg Dalton, Nis Palm Suppli, Marianne Ewertz, Niels Kroman, Luigi Grassi, Christoffer Johansen

Department of Clinical Medicine

6 Citations (Scopus)

Abstract

OBJECTIVES: To investigate overall and breast cancer-specific mortality in early-stage breast cancer patients with and without schizophrenia or related disorders.

METHODS: We used Danish national registers to identify all women with no prior history of cancer or organic mental disorders, who were diagnosed with early-stage breast cancer 1995-2011. Logistic regression models were used to calculate the odds ratios (ORs) for not being allocated to guideline treatment. Cox regression models were used to compute hazard ratios (HRs) for overall and breast cancer-specific deaths among women allocated or not allocated to guideline treatment.

RESULTS: We identified 56,152 women with early-stage breast cancer diagnosed in 1995-2011, of whom 499 women also had been diagnosed with schizophrenia or related disorders. The likelihood of women with schizophrenia or related disorders for not being allocated to guideline treatment was increased (adjusted OR, 1.50; 95% confidence interval (CI), 1.15-1.94). The adjusted HR for all-cause mortality was 1.55; 95% CI, 1.32-1.82 and 1.12 (95% CI, 0.98-1.50) for breast cancer-specific mortality; women allocated to guideline treatment had an adjusted HR for breast cancer-specific death of 1.42 (95% CI, 1.11-1.82). The adjusted HR for death due to unnatural causes was 3.67 (95% CI, 1.80-7.35).

CONCLUSION: The survival of women with schizophrenia or related disorders after breast cancer is significantly worse than that of women without these disorders. These patients are less likely to be allocated to guideline treatment, and, among those who are, mortality from both breast cancer and other causes is increased.

Original language	English
Journal	The Breast
Volume	40
Pages (from-to)	170-176
Number of pages	7
ISSN	0960-9776
DOIs	https://doi.org/10.1016/j.breast.2018.06.002
Publication status	Published - Aug 2018

Keywords

Adult
Aged
Aged, 80 and over
Breast Neoplasms/mortality
Cohort Studies
Denmark/epidemiology
Female
Humans
Logistic Models
Middle Aged
Odds Ratio
Proportional Hazards Models
Registries
Risk Factors
Schizophrenia/complications

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.breast.2018.06.002

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@article{ba597ba3c93d453faf4b5dfcc9d64cc7,

title = "Impact of schizophrenia and related disorders on mortality from breast cancer: A population-based cohort study in Denmark, 1995-2011",

abstract = "OBJECTIVES: To investigate overall and breast cancer-specific mortality in early-stage breast cancer patients with and without schizophrenia or related disorders.METHODS: We used Danish national registers to identify all women with no prior history of cancer or organic mental disorders, who were diagnosed with early-stage breast cancer 1995-2011. Logistic regression models were used to calculate the odds ratios (ORs) for not being allocated to guideline treatment. Cox regression models were used to compute hazard ratios (HRs) for overall and breast cancer-specific deaths among women allocated or not allocated to guideline treatment.RESULTS: We identified 56,152 women with early-stage breast cancer diagnosed in 1995-2011, of whom 499 women also had been diagnosed with schizophrenia or related disorders. The likelihood of women with schizophrenia or related disorders for not being allocated to guideline treatment was increased (adjusted OR, 1.50; 95% confidence interval (CI), 1.15-1.94). The adjusted HR for all-cause mortality was 1.55; 95% CI, 1.32-1.82 and 1.12 (95% CI, 0.98-1.50) for breast cancer-specific mortality; women allocated to guideline treatment had an adjusted HR for breast cancer-specific death of 1.42 (95% CI, 1.11-1.82). The adjusted HR for death due to unnatural causes was 3.67 (95% CI, 1.80-7.35).CONCLUSION: The survival of women with schizophrenia or related disorders after breast cancer is significantly worse than that of women without these disorders. These patients are less likely to be allocated to guideline treatment, and, among those who are, mortality from both breast cancer and other causes is increased.",

keywords = "Adult, Aged, Aged, 80 and over, Breast Neoplasms/mortality, Cohort Studies, Denmark/epidemiology, Female, Humans, Logistic Models, Middle Aged, Odds Ratio, Proportional Hazards Models, Registries, Risk Factors, Schizophrenia/complications",

author = "Dalton, {Susanne Oksbjerg} and Suppli, {Nis Palm} and Marianne Ewertz and Niels Kroman and Luigi Grassi and Christoffer Johansen",

note = "Copyright {\textcopyright} 2018. Published by Elsevier Ltd.",

year = "2018",

month = aug,

doi = "10.1016/j.breast.2018.06.002",

language = "English",

volume = "40",

pages = "170--176",

journal = "Breast",

issn = "0960-9776",

publisher = "Churchill Livingstone",

}

TY - JOUR

T1 - Impact of schizophrenia and related disorders on mortality from breast cancer

T2 - A population-based cohort study in Denmark, 1995-2011

AU - Dalton, Susanne Oksbjerg

AU - Suppli, Nis Palm

AU - Ewertz, Marianne

AU - Kroman, Niels

AU - Grassi, Luigi

AU - Johansen, Christoffer

PY - 2018/8

Y1 - 2018/8

N2 - OBJECTIVES: To investigate overall and breast cancer-specific mortality in early-stage breast cancer patients with and without schizophrenia or related disorders.METHODS: We used Danish national registers to identify all women with no prior history of cancer or organic mental disorders, who were diagnosed with early-stage breast cancer 1995-2011. Logistic regression models were used to calculate the odds ratios (ORs) for not being allocated to guideline treatment. Cox regression models were used to compute hazard ratios (HRs) for overall and breast cancer-specific deaths among women allocated or not allocated to guideline treatment.RESULTS: We identified 56,152 women with early-stage breast cancer diagnosed in 1995-2011, of whom 499 women also had been diagnosed with schizophrenia or related disorders. The likelihood of women with schizophrenia or related disorders for not being allocated to guideline treatment was increased (adjusted OR, 1.50; 95% confidence interval (CI), 1.15-1.94). The adjusted HR for all-cause mortality was 1.55; 95% CI, 1.32-1.82 and 1.12 (95% CI, 0.98-1.50) for breast cancer-specific mortality; women allocated to guideline treatment had an adjusted HR for breast cancer-specific death of 1.42 (95% CI, 1.11-1.82). The adjusted HR for death due to unnatural causes was 3.67 (95% CI, 1.80-7.35).CONCLUSION: The survival of women with schizophrenia or related disorders after breast cancer is significantly worse than that of women without these disorders. These patients are less likely to be allocated to guideline treatment, and, among those who are, mortality from both breast cancer and other causes is increased.

AB - OBJECTIVES: To investigate overall and breast cancer-specific mortality in early-stage breast cancer patients with and without schizophrenia or related disorders.METHODS: We used Danish national registers to identify all women with no prior history of cancer or organic mental disorders, who were diagnosed with early-stage breast cancer 1995-2011. Logistic regression models were used to calculate the odds ratios (ORs) for not being allocated to guideline treatment. Cox regression models were used to compute hazard ratios (HRs) for overall and breast cancer-specific deaths among women allocated or not allocated to guideline treatment.RESULTS: We identified 56,152 women with early-stage breast cancer diagnosed in 1995-2011, of whom 499 women also had been diagnosed with schizophrenia or related disorders. The likelihood of women with schizophrenia or related disorders for not being allocated to guideline treatment was increased (adjusted OR, 1.50; 95% confidence interval (CI), 1.15-1.94). The adjusted HR for all-cause mortality was 1.55; 95% CI, 1.32-1.82 and 1.12 (95% CI, 0.98-1.50) for breast cancer-specific mortality; women allocated to guideline treatment had an adjusted HR for breast cancer-specific death of 1.42 (95% CI, 1.11-1.82). The adjusted HR for death due to unnatural causes was 3.67 (95% CI, 1.80-7.35).CONCLUSION: The survival of women with schizophrenia or related disorders after breast cancer is significantly worse than that of women without these disorders. These patients are less likely to be allocated to guideline treatment, and, among those who are, mortality from both breast cancer and other causes is increased.

KW - Adult

KW - Aged

KW - Aged, 80 and over

KW - Breast Neoplasms/mortality

KW - Cohort Studies

KW - Denmark/epidemiology

KW - Female

KW - Humans

KW - Logistic Models

KW - Middle Aged

KW - Odds Ratio

KW - Proportional Hazards Models

KW - Registries

KW - Risk Factors

KW - Schizophrenia/complications

U2 - 10.1016/j.breast.2018.06.002

DO - 10.1016/j.breast.2018.06.002

M3 - Journal article

C2 - 29902718

SN - 0960-9776

VL - 40

SP - 170

EP - 176

JO - Breast

JF - Breast

ER -

Impact of schizophrenia and related disorders on mortality from breast cancer: A population-based cohort study in Denmark, 1995-2011

Abstract

Keywords

UN SDGs

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