The St. Gallen 2001 Consensus Criteria
The St. Gallen 2001 "minimal-low risk" group was defined as those patients who fulfil all of the following four criteria: 1) node negative patients older than 35 years, 2) ER and/or PgR positive, 3) well differentiated (grade1) tumor, 4) tumor size smaller or equal to 2 cm in diameter (ref). Patients who do not fulfil these criteria are classified as having "average-high" risk.
Goldhirsch A, Glick JH, Gelber RD, Coates AS, Senn HJ. Meeting highlights: International Consensus Panel on the Treatment of Primary Breast Cancer. Seventh International Conference on Adjuvant Therapy of Primary Breast Cancer. J Clin Oncol 2001;19(18):3817-27.