Proton Facility Economics: Single-Room Centers.

Objective: We have previously described the central nature of simple cases for financial feasibility of proton beam therapy centers-especially four- to five-room centers. In the 5 years since that publication, such construction has slowed drastically, and smaller, single-room projects are in vogue. We now seek to show under what circumstances a single-room system is optimally financially viable.

Materials And Methods: A "standard" construction cost and debt for a single gantry system of $40 million was presumed, with 75% of the construction funded through standard 20-year financing. We then modeled a statistical analysis, deriving the optimal case mix required daily to cover construction and debt service costs.

Results: We previously published that a single gantry treating only complex patients would need to apply 85% of its treatment slots simply to service debt, though it would cover its debt treating 4 hours of simple patients. As the business model has changed, debt maintenance, profit and operational costs have somewhat reduced the business case for adding a large number of simple patients. Debt maintenance is possible with as little as 13% of daily patients for a 40% Medicare case mix, but these numbers are critically sensitive to continued patient throughput.

Conclusions: Even in a single-room system, reducing overall debt, using tax-exempt financing, and having a case load emphasizing simple, private payer patients is paramount to fiscal health of the facility. Unused capacity is a huge risk if insufficient patients are available.