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Table 1 Simplified St. Gallen categories of the molecular subtypes

From: Role of ultrasound in predicting the molecular subtypes of invasive breast ductal carcinoma

LA subtype ER and/or PR positive, HER2 negative, and Ki-67 index < 14%
LB (HER2−) subtype ER and/or PR positive, HER2 negative, and Ki-67 > 14%
LB (HER2+) subtype ER and/or PR positive and HER-2 positive and Ki-67 > 14%
HER2 subtype ER, PR negative, and HER 2 positive
TN subtype ER, PR, and HER 2 negative