Figure 4.

Two-way sensitivity analysis of net benefits using willing-to-pay (WTP) of $100000 per quality-adjusted life-year (QALY) between percentage of utility increase and relative risk of intensity modulated radiation therapy (IMRT) in reducing recurrence. The upper area indicates combinations where IMRT is cost-effective with a WTP threshold of $100000 per QALY, and lower area indicates combinations where external beam radiation therapy (EBRT) is cost-effective with the same WTP threshold constraint.