Table 3.

SRS Response rate at follow-up MRI

Treatment	Scan interval, d (range)	CR	PR	Stable	PD
SRS + pembro (n = 23)	57 (39-118)	8 (35%)	8 (35%)	6 (26%)	1 (4%)
SRS + ipi (n = 31)	53 (41-95)	4 (13%)	6 (19%)	19 (61%)	2 (6%)
SRS (n = 27)	51 (28-130)	1 (4%)	5 (19%)	18 (67%)	3 (11%)

Response assessment adapted from RANO proposal (Lin et al. 2015)

CR = complete response (disappearance of target lesion)

PR = partial response (lesion visible, ≥ 30% decrease in max diameter)

Stable = stable response (lesion visible, < 30% decrease OR <20% increase in max diameter)

PD = progressive disease (lesion visible, ≥ 20% increase in max diameter)