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Table 1 Definition of risk categories for breast cancer patients who had undergone surgery, according to the 2005 St. Gallen guidelines

From: A comparison of survival outcomes and side effects of toremifene or tamoxifen therapy in premenopausal estrogen and progesterone receptor positive breast cancer patients: a retrospective cohort study

Risk Category

Patient Features

Low risk

Node negative AND all of the following features:

pT ≤2 cm,

Grade 1,

Absence of peritumoral vascular invasion,

HER2/neu gene neither overexpressed nor amplified,

Age ≥35 years

Intermediate risk

Node negative AND at least one of the following features:

pT >2 cm,

Grade 2–3,

Presence of peritumoral vascular invasion,

HER2/neu gene overexpressed or amplified,

Age >35 years

Node positive (1–3 involved nodes) AND

HER2/neu gene neither overexpressed nor amplified

High risk

Node positive (1–3 involved nodes) AND

HER2/neu gene overexpressed or amplified

Node positive (4 or more involved nodes)