COST-UTILITY ANALYSIS OF UPFRONT PHARMACOTHERAPY COMPARED TO AN UPFRONT SURGICAL INTERVENTION FOR PATIENTS WITH BENIGN PROSTATE HYPERPLASIA
INTRODUCTION
Benign prostate hyperplasia (BPH) may lead to lower urinary tract symptoms. Patients with moderate-to-severe symptoms usually start upfront pharmacotherapy (e.g., alpha-blockers, 5-alpha reductase inhibitors, or combination). Pharmacotherapy doesn’t necessarily cure BPH & patients may require subsequent surgical interventions such as transurethral resection of the prostate (TURP). An alternative to TURP & pharmacotherapy, Greenlight laser photoselective vaporization of the prostate (GL-PVP), has lower costs compared to TURP & faster symptomatic improvement compared to pharmacotherapy. The purpose of this study was to evaluate the cost-utility of upfront pharmacotherapy (i.e., alpha-blockers or 5-ARI or combination) followed by delayed surgical intervention (i.e., TURP, GL-PVP) for those who fail, compared to receiving an upfront surgical intervention.
METHODS
The target population were men with moderate-to-severe symptoms & no contraindications for BPH surgery. Microsimulation was used to model the progression of BPH symptoms, cost projection & quality-adjusted life-years (QALYs). Pharmacotherapy costs were obtained from the Ontario Drug Benefit Formulary. BPH surgeries costs were collected retrospectively. All other outcomes were obtained from the literature. Cost-utility analysis used a Canadian public payer perspective, a life-time time horizon, a discount rate of 1.5% & a willingness-to-pay threshold of $50,000 per QALY. Probabilistic sensitivity analysis (PSA) was performed to estimate parameter uncertainty.
RESULTS
Compared to the upfront pharmacotherapy options, upfront surgical interventions were, on average, more costly & more effective with the incremental cost per QALY gained ranging by drug type from $2,138 to $2,911 for upfront GL-PVP & $5,473 to $6,646 for upfront TURP options. Compared to upfront TURP, upfront GL-PVP was associated with lower costs ($9,468 vs. $11,562) & a marginally lower effectiveness (15.20 vs. 15.24 QALYs) translating to an incremental cost per QALY of $53,417 more gained. PSA indicated that upfront GL-PVP would be cost-effective 47% of the time at a threshold of $50,000/QALY.
CONCLUSION
In general, upfront BPH surgery is cost-effective option relative to pharmacotherapy. Given the lower costs, relative effectiveness & better safety, GL-PVP may be considered as an upfront intervention for certain patients with moderate-to-severe BPH.
Funding: This study was funded with the support of a research grant from Boston Scientific.