Background Venous thromboembolism (VTE) may be a harbinger of cancer in the general population. Patients with kidney disease have an a priori increased VTE risk. However, it remains unknown how a VTE affects subsequent cancer risk in these patients. Objectives To examine the cancer risk in patients with kidney disease following a VTE. Methods We conducted a nationwide population-based cohort study in Denmark (1996–2017), including all VTE patients with a diagnosis of kidney disease. We calculated absolute risks of cancer (accounting for competing risk of death) and age-, sex-, and calendar-period standardized incidence ratios (SIRs) comparing the observed cancer incidence with national cancer incidence rates and cancer incidence rates of VTE patients without kidney disease. Results We followed 3,362 VTE patients with kidney disease (45.9% females) for a median follow-up time of 2.4 years (interquartile range: 0.6–5.4). During follow-up, 464 patients were diagnosed with cancer, of whom 169 (36.4%) were diagnosed within the first year. The 1-year absolute risk of any cancer was 5.0% (95% confidence interval [CI]: 4.3–5.8), with a SIR of 2.9 (95% CI: 2.5–3.4) when compared with the general population, and 2.0 (95% CI: 1.8–2.4) when compared with VTE patients without kidney disease. During subsequent years of follow-up, the SIRs declined to 1.5 (95% CI: 1.3–1.6) when compared with the general population, and 1.1 (95% CI: 0.9–1.2) compared with VTE patients without kidney disease. Conclusions Patients with hospital-diagnosed kidney disease have increased cancer risk after VTE, especially within the first year following the VTE diagnosis.

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Background: Previous studies of the effect of interaction between psychiatric disorders on suicide have reported mixed results. We investigated the joint effect of depression and various comorbid psychiatric disorders on suicide. Methods: We conducted a population-based case-cohort study with all suicide deaths occurring between 1 January 1995 and 31 December 2015 in Denmark (n = 14,103) and a comparison subcohort comprised of a 5% random sample of the source population at baseline (n = 265,183). We quantified the joint effect of pairwise combinations of depression and major psychiatric disorders (e.g., organic disorders, substance use disorders, schizophrenia, bipolar disorder, neurotic disorders, eating disorders, personality disorders, intellectual disabilities, developmental disorders, and behavioral disorders) on suicide using marginal structural models and calculated the relative excess risk due to interaction. We assessed for the presence of competing antagonism for negative relative excess risk due to interactions. Results: All combinations of depression and comorbid psychiatric disorders were associated with increased suicide risk. For example, the rate of suicide among men with depression and neurotic disorders was 20 times (95% CI = 15, 26) the rate in men with neither disorder. Most disorder combinations were associated with subadditive suicide risk, and there was evidence of competing antagonism in most of these cases. Conclusions: Subadditivity may be explained by competing antagonism. When both depression and a comorbid psychiatric disorder are present, they may compete to cause the outcome such that having 2 disorders may be no worse than having a single disorder with respect to suicide risk.

AimA laparoscopic approach to total colectomy (TC) for inflammatory bowel disease (IBD) is being increasingly used, but data on its comparative benefits over open TC are conflicting. The aim of this study was to examine 90‐day outcomes following laparoscopic and open TC for IBD in a nationwide cohort after the introduction of laparoscopy.MethodIBD patients undergoing TC in Denmark from 2005 to 2017 were identified from the Danish National Patient Registry. We used Kaplan–Meier methodology to estimate mortality and Cox regression analysis to estimate adjusted mortality rate ratios (aMRRs) and adjusted hazard ratios (aHRs) of reoperation, readmission and intensive care unit (ICU) transfer, comparing patients undergoing laparoscopic versus open TC.ResultsWe identified 1095 patients undergoing laparoscopic TC and 1523 patients undergoing open TC. Following emergency TC, 90‐day mortality was 2.8% (1.6%–4.9%) after laparoscopic TC and 9.1% (7.0%–11.8%) after open TC. Ninety‐day mortality was 0.9% (0.3%–2.5%) after laparoscopic TC and 2.6% (1.5%–4.3%) after open elective TC. The aMRRs associated with laparoscopic TC were 0.45 (95% CI 0.25–0.80) in emergency cases and 0.29 (95% CI 0.10–0.86) in elective cases. Risks of readmission were comparable following laparoscopic versus open TC, both in emergency [aHR = 0.93 (95% CI 0.76–1.15)] and elective [aHR = 0.83 (95% CI 0.68–1.02)] cases, while risks of ICU transfer and reoperation were lower following laparoscopic TC, both in emergency cases [aHR = 0.53 (95% CI 0.35–0.82) and aHR = 0.26 (95% CI 0.15–0.47)] and elective [aHR = 0.58 (95% CI 0.35–0.95) and aHR = 0.37 (95% CI 0.21–0.66)] cases.ConclusionThe introduction of laparoscopic TC for IBD in Denmark was not associated with increased mortality or morbidity. In fact, laparoscopic TC for IBD may be associated with lower short‐term mortality and morbidity compared with open TC.