ROC curves of the fast and accurate SFFS feature selection algorithm (SFFS), SVM trained with all features (All feas), and SFS based on a small within-class distance and a large between-class distance (SFS) of applying our image-based mass classification system to correctly classify the mass ROIs in our image database as benign or malignant. The computed AUC results and 95 confidence intervals are as follows – SFFS: 0.805 [0.779, 0.828]; All feas: 0.807 [0.782, 0.831] and SFS: 0.749 [0.721, 0.775].