ERBB2 and triple-negative breast carcinoma: The clinical subtypes are based on the expression of the estrogen receptor (ER) and the progesterone receptor (PR) and the amplification of the HER2 (ERBB2) receptor and include hormone receptor (HR)-positive (HR+/HER2−, also ER+/PR+/HER2−), triple-positive (HR+/HER2+, also ER+/PR+/HER2+), HER2-positive (ER−/PR−/HER2+, also HER2+), and triple-negative breast cancer (TNBC) (HR−/HER2−, also ER−/PR−/HER2−) [2,3,4].