2. Liljegren G, Holmberg L, Bergh J, Lindgren A, Tabár L, Nordgren H, et al. 10-Year results after sector resection with or without postoperative radiotherapy for stage I breast cancer: a randomized trial. J Clin Oncol 1999;17:2326-33.
3. Brewster AM, Hortobagyi GN, Broglio KR, Kau SW, Santa-Maria CA, Arun B, et al. Residual risk of breast cancer recurrence 5 years after adjuvant therapy. J Natl Cancer Inst 2008;100:1179-8.
4. Jatoi I, Tsimelzon A, Weiss H, Clark G, Hilsenbeck S. Hazard rates of recurrence following diagnosis of primary breast cancer. Breast Cancer Res Treat 2005;89:173-8.
5. Saphner T, Tormey DC, Gray R. Annual hazard rates of recurrence for breast cancer after primary therapy. J Clin Oncol 1996;14:2738-46.
6. Hollowell K, Olmsted CL, Richardson AS, Pittman HK, Bellin L, Tafra L, et al. American Society of Clinical Oncology-recommended surveillance and physician specialty among long-term breast cancer survivors. Cancer 2010;116:2090-8.
7. Ravdin PM, Siminoff LA, Davis GJ, Mercer MB, Hewlett J, Gerson N, et al. Computer program to assist in making decisions about adjuvant therapy for women with early breast cancer. J Clin Oncol 2001;19:980-91.
9. Galea MH, Blamey RW, Elston CE, Ellis IO. The Nottingham Prognostic Index in primary breast cancer. Breast Cancer Res Treat 1992;22:207-1.
10. Epanechnikov VA. Non-parametric estimation of a multivariate probability density. Theory Probab Appl 1969;14:153-8.
11. Clarke M, Collins R, Darby S, Davies C, Elphinstone P, Evans E, et al. Effects of radiotherapy and of differences in the extent of surgery for early breast cancer on local recurrence and 15-year survival: an overview of the randomised trials. Lancet 2005;366:2087-106.
12. Cheng L, Swartz MD, Zhao H, Kapadia AS, Lai D, Rowan PJ, et al. Hazard of recurrence among women after primary breast cancer treatment: a 10-year follow-up using data from SEER-Medicare. Cancer Epidemiol Biomarkers Prev 2012;21:800-9.
13. Lowery AJ, Kell MR, Glynn RW, Kerin MJ, Sweeney KJ. Locoregional recurrence after breast cancer surgery: a systematic review by receptor phenotype. Breast Cancer Res Treat 2012;133:831-41.
14. Wang Y, Yin Q, Yu Q, Zhang J, Liu Z, Wang S, et al. A retrospective study of breast cancer subtypes: the risk of relapse and the relations with treatments. Breast Cancer Res Treat 2011;130:489-98.
15. Nixon AJ, Neuberg D, Hayes DF, Gelman R, Connolly JL, Schnitt S, et al. Relationship of patient age to pathologic features of the tumor and prognosis for patients with stage I or II breast cancer. J Clin Oncol 1994;12:888-94.
16. Bollet MA, Sigal-Zafrani B, Mazeau V, Savignoni A, de la Rochefordière A, Vincent-Salomon A, et al. Age remains the first prognostic factor for loco-regional breast cancer recurrence in young (<40 years) women treated with breast conserving surgery first. Radiother Oncol 2007;82:272-80.
17. Halverson KJ, Perez CA, Taylor ME, Myerson R, Philpott G, Simpson JR, et al. Age as a prognostic factor for breast and regional nodal recurrence following breast conserving surgery and irradiation in stage I and II breast cancer. Int J Radiat Oncol Biol Phys 1993;27:1045-50.
18. Colleoni M, Rotmensz N, Robertson C, Orlando L, Viale G, Renne G, et al. Very young women (<35 years) with operable breast cancer: features of disease at presentation. Ann Oncol 2002;13:273-9.
19. Fisher B, Redmond C, Fisher ER, Caplan R. Relative worth of estrogen or progesterone receptor and pathologic characteristics of differentiation as indicators of prognosis in node negative breast cancer patients: findings from National Surgical Adjuvant Breast and Bowel Project Protocol B-06. J Clin Oncol 1988;6:1076-87.
20. Costa SD, Lange S, Klinga K, Merkle E, Kaufmann M. Factors influencing the prognostic role of oestrogen and progesterone receptor levels in breast cancer: results of the analysis of 670 patients with 11 years of follow-up. Eur J Cancer 2002;38:1329-34.