Document Type : Research Articles
Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
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.