Jerzak, Katarzyna J.; Pritchard, Kathleen I. (2016-11-01). "The 21-gene recurrence score assay in node-negative early breast cancer: Prognostic, predictive or presumptuous?". European Journal of Cancer. 68: 173–175. doi:10.1016/j.ejca.2016.08.021. PMID27768924.
Jerzak, Katarzyna J.; Pritchard, Kathleen I. (2016-11-01). "The 21-gene recurrence score assay in node-negative early breast cancer: Prognostic, predictive or presumptuous?". European Journal of Cancer. 68: 173–175. doi:10.1016/j.ejca.2016.08.021. PMID27768924.