Suicide risk following a new cancer diagnosis among veterans in Veterans Health Administration care.
Authors: Dent Kallisse R. , Szymanski Benjamin R. , Kelley Michael J. , Katz Ira , McCarthy John F. 
Published: June 2021

12130

Background: Patients diagnosed with cancer are at an increased risk of adverse mental health outcomes including suicidal behavior. Suicide rates among Veterans are 50 percent greater than for non-Veteran US adults. To inform Veterans Affairs (VA) suicide prevention initiatives, it is important to understand associations between cancer and suicide risk among Veterans receiving VA healthcare from the Veterans Health Administration (VHA). Study aims were to assess associations between new cancer diagnoses and suicide among Veterans in VHA care to identify high risk diagnostic subgroups and risk-periods. Methods: We used a cohort study design, identifying 4,926,373 Veterans with VHA use in 2011 and either 2012 or 2013 and without a VHA cancer diagnosis in 2011. Incident cancer diagnoses, assessed between first VHA use in 2012-2013 and 12/31/2018, were characterized by subtype and stage using the VHA Oncology Raw Data. Data from the VA/Department of Defense Mortality Data Repository identified date and cause of death. Cox proportional hazards regression, accounting for time-varying cancer diagnosis, was used to evaluate associations between a new cancer diagnosis and suicide risk. An initial model adjusted for VHA regional network and patient age and sex. Cancer subtypes with significant associations with suicide were further assessed using a model that also adjusted for suicide attempts and mental health, tobacco use disorder, and other substance use disorder diagnoses in the prior year. Crude suicide rates following a new cancer diagnoses were calculated among Veterans with new diagnoses, 2012-2018 (N = 240,410). Rates were assessed up to 84 months following diagnosis. Results: On average, Veteran VHA users were followed for 6.0 years after their first VHA use in 2012-2013 and for 2.7 years following a new cancer diagnosis. Receipt of a new cancer diagnosis corresponded to a 43% (Adjusted Hazard Ratio [AHR] = 1.43, 95% CI: 1.29, 1.58) higher suicide risk, adjusting for covariates. The cancer subtype associated with the highest suicide risk was esophageal cancer (AHR = 5.93, 95% CI: 4.05, 10.51) and other significant subtypes included head and neck (AHR = 3.44, 95% CI: 2.65, 4.46) and lung cancer (AHR = 2.28, 95% CI: 1.79, 2.90). Cancer stages 3 (AHR = 2.29, 95% CI: 1.75, 3.01) and 4 (AHR = 3.45, 95% CI: 2.75, 4.34) at diagnosis were also positively associated with suicide risk. Suicide rates were highest in the first three months following a diagnosis (Rate = 128.3 per 100,000 person-years, 95% CI: 100.4, 161.6) and remained elevated through the first 12 months. Conclusions: Among Veteran VHA users, suicide risk was elevated following a new cancer diagnosis and was especially high in the initial 3 months. Additional screening and suicide prevention efforts may be warranted for VHA Veterans newly diagnosed with cancer, particularly among those diagnosed with esophageal, head and neck, or lung cancer or at stages 3 or 4.