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Original Investigation
March 7, 2019

Long-term Somatic Disease Risk in Adult Danish Cancer Survivors

Author Affiliations
  • 1Survivorship Unit, Danish Cancer Society Research Center, Copenhagen, Denmark
  • 2Unit of Statistics and Pharmacoepidemiology, Danish Cancer Society Research Center, Copenhagen, Denmark
  • 3Childhood Cancer Research Group, Danish Cancer Society Research Center, Copenhagen, Denmark
  • 4Department of Clinical Medicine, Faculty of Health, Aarhus University, Aarhus, Denmark
  • 5Department of Urology, Aarhus University Hospital, Aarhus, Denmark
  • 6Cancer Epidemiology & Population Health, King’s College London, London, England
  • 7The Danish Clinical Registries, Aarhus, Denmark
  • 8Copenhagen Prostate Cancer Center, Department of Urology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
  • 9Department of Oncology, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
  • 10Department of Clinical Oncology & Palliative Care, Zealand University Hospital, Naestved, Denmark
JAMA Oncol. 2019;5(4):537-545. doi:10.1001/jamaoncol.2018.7192
Key Points

Question  What are the incidence and temporal pattern of somatic diseases that require hospitalization in adult cancer survivors?

Findings  In this population-based study of 458 646 cancer survivors and 2 121 567 cancer-free comparison people with up to 17 years of follow-up after cancer diagnosis, cancer survivors had a higher risk of hospitalization for a broad range of incident diseases after the cancer diagnosis than did cancer-free comparison people, mostly pronounced in the first years after the cancer diagnosis.

Meaning  The diversity of health problems in adult cancer survivors suggests the importance of close posttreatment monitoring in the primary and secondary health sectors.

Abstract

Importance  Long-term health effects of cancer in adult survivors are a major concern; however, it is difficult to differentiate between the consequences of cancer and cancer treatment and those of normal aging or comorbidity.

Objectives  To provide an overview and investigate the temporal pattern of hospitalizations for medically verified incident somatic disease in adult survivors compared with cancer-free comparison people, taking into consideration pretreatment comorbidity and the socioeconomic position of the participants.

Design, Setting, and Participants  In this nationwide, population-based cohort-cohort study, 458 646 survivors of the 12 most frequent first primary cancers listed in the Danish Cancer Registry between January 1, 1997, and December 31, 2014, and 2 121 567 matched cancer-free comparison people were identified from the Danish Central Population Registry. Hospitalizations for somatic diseases after cancer diagnosis or study entry were identified from the National Patient Register and stratified according to the 11 main diagnostic groups in the International Statistical Classification of Diseases and Related Health Problems, Tenth Revision. A cohort of cancer survivors was formed for each combination of cancer type and diagnostic group, with a corresponding group of cancer-free people, resulting in 132 unique cohorts. Data analysis was performed from September 1, 2017, to January 15, 2018.

Main Outcomes and Measures  Risk of hospitalization and the temporal pattern of incidence were analyzed in Cox proportional hazards regression models. Cumulative incidence proportions were calculated by the pseudo-observation method.

Results  A total of 2 580 213 people were investigated, of whom 458 646 were cancer survivors (mean [SD] age, 69 [11.6] years; 230 793 [50.3%] male and 227 853 [49.7%] female) and 2 121 567 were comparison people (mean [SD] age, 69 [11.5] years; 1 054 465 [49.7%] male and 1 067 102 [50.3%] female). More cancer survivors vs comparison people had comorbid conditions at the time of cancer diagnosis or study entry (Charlson Comorbidity Index ≥1: 19% vs 13%). Overall, the risk of hospitalizations for somatic diseases was significantly higher for cancer survivors in almost all diagnostic groups (eg, diseases in the nervous system among breast cancer survivors: hazard ratio, 1.20; 95% CI, 1.17-1.22; diseases in the respiratory system in lung cancer survivors: hazard ratio, 5.85; 95% CI, 5.63-6.07; and diseases in blood and blood-forming organs in prostate cancer survivors: hazard ratio, 2.60; 95% CI, 2.50-2.71).

Conclusions and Relevance  The findings suggest that adult survivors of the 12 most common cancers are at significantly higher risk for a broad range of somatic diseases that require hospitalization compared with matched cancer-free comparison people. The results of this study suggest the importance of close, targeted monitoring for new somatic disease during follow-up care of cancer survivors.

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