Use of inpatient systemic chemotherapy and/or radiotherapy and related predictive factors, healthcare resource utilization, and direct hospitalization costs for metastatic urothelial cancer: findings from a real-world retrospective observational study derived from the national hospital discharge claims database in Italy

Recent real-world studies revealed high proportions of patients with metastatic urothelial cancer (mUC) do not receive any systemic therapy. This study describes the demographics, clinical characteristics, treatment rate and related predictive factors, healthcare resource utilization, and direct medical costs of patients with mUC receiving systemic therapy (or not) in the inpatient setting in Italy.This retrospective observational study used the national hospital discharge database (Scheda di Dimissione Ospedaliera) to describe incident adult (≥ 18 years) patients with a first hospitalization for mUC (index) from 2017-2018, identified by a combination of ICD-9-CM (International Classification of Diseases, Ninth Revision, Clinical Modification), medical procedure, and diagnosis-related group codes. A model was fitted to identify factors associated with receiving inpatient chemotherapy and/or radiotherapy.Of 3674 patients with mUC identified, 1014 (27.6%) were treated with inpatient chemotherapy and/or radiotherapy and 2660 (72.4%) were not treated. The median age at index was 71 and 78 years for treated and untreated patients, and the mean (SD) Charlson Comorbidity Index (CCI) score was 0.3 (0.8) and 0.6 (1.1), respectively. Primary tumor location was the bladder in 87.2% of patients. Cardiovascular disease and renal function impairment were more prevalent in untreated (22.6% and 13.2%) vs treated (16.7% and 7.8%) patients. Older age (odds ratio [p-value]) (0.94 [