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A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients

BACKGROUND: Gastrointestinal cancer is one of the common causes of death from cancer in Iran. Survival analysis is usually used to detect prognostic factors of time to death from gastrointestinal cancers. The use of ordinary survival models, in the presence of competing risks and/or when data is col...

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Autores principales: Hesam, Saeed, Mahmoudi, Mahmood, Foroushani, Abbas Rahimi, Yaseri, Mehdi, Mansournia, Mohammad Ali
Formato: Online Artículo Texto
Lenguaje:English
Publicado: West Asia Organization for Cancer Prevention 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6291038/
https://www.ncbi.nlm.nih.gov/pubmed/30362330
http://dx.doi.org/10.22034/APJCP.2018.19.10.2947
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author Hesam, Saeed
Mahmoudi, Mahmood
Foroushani, Abbas Rahimi
Yaseri, Mehdi
Mansournia, Mohammad Ali
author_facet Hesam, Saeed
Mahmoudi, Mahmood
Foroushani, Abbas Rahimi
Yaseri, Mehdi
Mansournia, Mohammad Ali
author_sort Hesam, Saeed
collection PubMed
description BACKGROUND: Gastrointestinal cancer is one of the common causes of death from cancer in Iran. Survival analysis is usually used to detect prognostic factors of time to death from gastrointestinal cancers. The use of ordinary survival models, in the presence of competing risks and/or when data is collected within geographic areas, may lead to distorting the results. Therefore, the aim of this study is to use the spatial survival models in the presence of competing risks to assess the risk factors affecting the survival time of gastrointestinal cancer patients. METHODS: The data in this study was collected from 602 patients who were diagnosed with gastrointestinal cancer in Golestan and Mazandaran provinces registered in Iran’s National Institute of Health Research from 2002 through 2007 and were followed up to July 2017. The data was analyzed using the cause-specific hazard frailty model with multivariate conditional autoregressive distribution for frailties in the presence of competing risks (death from gastrointestinal cancer, heart disease, and other causes) via OpenBUGS software. RESULTS: The hazard of death from gastrointestinal cancer in men patients, patients who lived in rural areas, patients whose relatives did not have a history of cancer, patients who did not undergo surgery, and patients with gastric cancer was significantly higher than others. Based on the deviance information criterion (DIC), frailty models and spatial frailty models seemed better than no-frailty model and non-spatial frailty model, respectively. CONCLUSIONS: This study showed that the use of the spatial frailty term in the model helps better fit the model. Also, the spatial pattern in the figures suggests the necessity of presence of some still missing, spatially varying covariates relevant for time to death from gastrointestinal cancer, heart disease, or other causes.
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spelling pubmed-62910382018-12-26 A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients Hesam, Saeed Mahmoudi, Mahmood Foroushani, Abbas Rahimi Yaseri, Mehdi Mansournia, Mohammad Ali Asian Pac J Cancer Prev Research Article BACKGROUND: Gastrointestinal cancer is one of the common causes of death from cancer in Iran. Survival analysis is usually used to detect prognostic factors of time to death from gastrointestinal cancers. The use of ordinary survival models, in the presence of competing risks and/or when data is collected within geographic areas, may lead to distorting the results. Therefore, the aim of this study is to use the spatial survival models in the presence of competing risks to assess the risk factors affecting the survival time of gastrointestinal cancer patients. METHODS: The data in this study was collected from 602 patients who were diagnosed with gastrointestinal cancer in Golestan and Mazandaran provinces registered in Iran’s National Institute of Health Research from 2002 through 2007 and were followed up to July 2017. The data was analyzed using the cause-specific hazard frailty model with multivariate conditional autoregressive distribution for frailties in the presence of competing risks (death from gastrointestinal cancer, heart disease, and other causes) via OpenBUGS software. RESULTS: The hazard of death from gastrointestinal cancer in men patients, patients who lived in rural areas, patients whose relatives did not have a history of cancer, patients who did not undergo surgery, and patients with gastric cancer was significantly higher than others. Based on the deviance information criterion (DIC), frailty models and spatial frailty models seemed better than no-frailty model and non-spatial frailty model, respectively. CONCLUSIONS: This study showed that the use of the spatial frailty term in the model helps better fit the model. Also, the spatial pattern in the figures suggests the necessity of presence of some still missing, spatially varying covariates relevant for time to death from gastrointestinal cancer, heart disease, or other causes. West Asia Organization for Cancer Prevention 2018 /pmc/articles/PMC6291038/ /pubmed/30362330 http://dx.doi.org/10.22034/APJCP.2018.19.10.2947 Text en Copyright: © Asian Pacific Journal of Cancer Prevention http://creativecommons.org/licenses/BY-SA/4.0 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
spellingShingle Research Article
Hesam, Saeed
Mahmoudi, Mahmood
Foroushani, Abbas Rahimi
Yaseri, Mehdi
Mansournia, Mohammad Ali
A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title_full A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title_fullStr A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title_full_unstemmed A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title_short A Spatial Survival Model in Presence of Competing Risks for Iranian Gastrointestinal Cancer Patients
title_sort spatial survival model in presence of competing risks for iranian gastrointestinal cancer patients
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6291038/
https://www.ncbi.nlm.nih.gov/pubmed/30362330
http://dx.doi.org/10.22034/APJCP.2018.19.10.2947
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