Impact of inflammatory bowel disease on urologic oncology surgical outcomes and costs of care.

Abstract

470 Background: Recent studies suggest an association between genitourinary malignancies and inflammatory bowel disease (IBD). Our objective was to investigate clinical and financial impacts of IBD on common major urologic cancer surgeries: radical prostatectomy (RP), radical cystectomy (RC), radical nephrectomy (RN), and partial nephrectomy (PN). Methods: Using ICD9 codes, the Premier Hospital Database was queried for patients who underwent one of four surgeries: RP, RC, RN, or PN from 2003 to 2015. The cohort was segregated into IBD patients and non-IBD patients. Multivariable logistic regression models were used to determine the independent impact of IBD on complication rates (by Clavien-Dindo classification and organ system) and readmission rates. Hospital cost differences between the two cohorts, adjusted to 2016 US dollars, were examined with multivariable quantile regression models. Results: Our study population included 220,192 patients with urological malignancies, 5165 (0.4%) of whom had IBD. After controlling for clinicodemographic variables, there were significantly higher odds for any complication (Clavien ≥1) for IBD patients compared to non-IBD controls for RC (Odds ratio [OR]: 3.04, 95% confidence interval [CI]: 1.25-7.43), RN (OR: 1.57, 95% CI: 1.1-2.23), and PN (OR: 1.5, 95% CI: 1.02-2.22). Specifically, IBD patients had significantly more gastrointestinal, infectious, and soft tissue complications. Readmission rates were significantly higher for IBD patients who underwent RC (OR: 2.50, 95% CI: 1.17-5.35) and PN (OR: 1.81, 95% CI: 1.17-2.80). Hospital costs were significantly elevated for IBD patients, ranging from +$893 (95% CI: 108-1677) to +$6261 (95% CI: 1861-10660). Conclusions: There was a significantly higher overall complication rate for IBD patients undergoing RC, RN, or PN compared to the non-IBD cohort. Hospital readmission rates were significantly higher for the IBD cohort who underwent RC and PN. Hospital costs associated with surgery were also increased for IBD patients. These findings may be important when counseling IBD patients about surgical outcomes and during development of enhanced recovery pathways or bundled payment programs.