Summary of the results in training and test subsets

	AUC	Accuracy	Sensitivity	Specificity
PCNSL vs GB
Training	0.96	88% (60/68)	88% (29/33)	89% (31/35)
Test	0.96	93% (25/27)	93% (13/14)	92% (12/13)
PCNSL vs AA
Training	0.86	74% (46/62)	76% (25/33)	72% (21/29)
Test	0.83	71% (17/24)	93% (13/14)	60% (6/10)
PCNSL vs MET
Training	0.92	81% (56/69)	81% (26/32)	81% (30/37)
Test	0.95	93% (25/27)	100% (14/14)	85% (11/13)
PCNSL vs MEN
Training	1.00	97% (67/69)	97% (32/33)	97% (35/36)
Test	0.93	96% (27/28)	100% (14/14)	93% (13/14)

Note:—GB indicates glioblastoma; AA, anaplastic astrocytoma; MET, metastasis; MEN, meningioma.