Figure 4.

The distribution of clinical characteristics of the 19 sporadic breast tumors used as an independent test set in the study by van't Veer et al. [7]. Estrogen receptor-α status is denoted as ER+ and ER-. Clinical outcome for the patients is represented by M+ (distant recurrences within 5 years) and M- (no recurrences within a follow-up period of at least 5 years).