Table I.

Classifier performances according to the blind classification of the testing tumours

Clinical aetiology		Predicted aetiology
RI	SP	RI	SP	Not classified
23		22	0	1
	13	1	8	4

Clinical aetiology: aetiology determined on the basis of the medical records, sarcoma developed in patients with (radiation-induced, RI) or without (sporadic, SP) irradiation history. Predicted aetiology: aetiology predicted using the transcriptome signature. Sensitivity 96%: proportion of RI sarcomas correctly classified among RI sarcomas. Specificity 62%: proportion of SP sarcomas correctly classified among SP sarcomas. Positive predictive value 96%: proportion of sarcomas with a positive test (RI) and correctly classified. Negative predictive value 100%: proportion of sarcomas with negative test (SP) and correctly classified.