Table 2.

Clinical outcomes of SBRT.

		Entire Cohort (N = 202)				Matched Cohort (N = 74)
		Overall (n = 202)	Photon SBRT (n = 168)	Proton SBRT (n = 34)	p value	Photon SBRT (n = 46)	Proton SBRT (n = 28)	p value
LC	2-year	92.7%	92.8%	92.8%	0.602	94.9%	91.3%	0.472
	5-year	90.1%	90.8%	83.6%		89.6%	81.1%
PFS	2-year	72.8%	74.4%	65.0%	0.370	67.7%	61.9%	0.508
	5-year	60.7%	61.6%	57.8%		62.9%	55.0%
OS	2-year	81.5%	83.3%	73.1%	0.475	81.3%	74.5%	0.535
	5-year	50.8%	51.7%	51.9%		43.4%	74.5%
CSS	2-year	90.1%	91.5%	83.5%	0.618	90.4%	80.4%	0.946
	5-year	69.2%	70.3%	62.6%		60.5%	80.4%

SBRT, stereotactic body radiation therapy; LC, local control; PFS, progression-free survival; OS, overall survival; CSS, cause-specific survival.