Open AccessUrban versus rural residency and pancreatic cancer survival: A Danish nationwide population-based cohort study
Author(s) -
Jakob Kirkegård,
Morten Ladekarl,
Claus Wilki Fristrup,
Carsten Palnæs Hansen,
Mogens Sall,
Frank Viborg Mortensen
Publication year - 2018
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0202486
Subject(s) - medicine , hazard ratio , pancreatic cancer , comorbidity , proportional hazards model , cancer , population , cohort , cohort study , quartile , cancer registry , confidence interval , demography , environmental health , sociology
It is unknown whether urban versus rural residency affects pancreatic cancer survival in a universal tax-financed healthcare system. We conducted a nationwide, population-based cohort study of all patients diagnosed with pancreatic cancer in Denmark from 2004–2015. We used nationwide registries to collect information on characteristics, comorbidity, cancer-directed treatment, and vital status. We followed the patients from pancreatic cancer diagnosis until death, emigration, or 1 October 2017, whichever occurred first. We truncated at five years of follow up. We stratified patients into calendar periods according to year of diagnosis (2004–2007, 2008–2011, and 2012–2015). We used Cox proportional hazards model to compute hazard ratios (HRs) with associated 95% confidence intervals (CIs) of death, comparing patients in urban and rural areas. HRs were adjusted for age, sex, comorbidity, tumor stage, and localization. In a sub-analysis, we also adjusted for cancer-directed treatment. We included 10,594 patients diagnosed with pancreatic cancer. Median age was 71 years (inter-quartile range: 63–78 years), and half were men. The majority (61.7%) lived in an urban area at the time of diagnosis. When adjusting for potential confounders, we observed a better survival rate among pancreatic cancer patients residing in urban areas compared with rural areas (adjusted HR: 0.92; 95% CI: 0.87–0.98). When taking treatment into account, the association was unclear (adjusted HR: 0.96; 95% CI: 0.88–1.04). Pancreatic cancer patients residing in urban areas had a slightly better survival rate compared with patients in rural areas.