Table 1. Efficiency of the blind classification of the three series of tumors by EMts_2PCA.

	EMts_2PCAP prediction			Score of the classifier
Groups	Well	False	?	RPE	GPE
FTAs	15	0	0	1	1
PTCs	13	0	0
Radiation-induced breast tumors	11	0	1	1	0.9
Sporadic breast tumors	9	0	1
Post-Chernobyl thyroid PTCs	5	0	1	1	0.92
Sporadic thyroid PTCs	6	0	1

RPE was defined by the number of correctly classified tumors divided by the number of predicted tumors (either correctly or incorrectly predicted) and GPE was defined by the number of correctly classified tumors divided by the total number of tumors (correctly classified, misclassified or unclassified). ?: unclassified; FTA: follicular thyroid adenoma; PTC: papillary thyroid carcinoma.