ERBB2 and breast neoplasm: Breast tumours that express the ER and/or progesterone receptor (PR) are quoted to be “hormone receptor-positive” BCs, whereas those that do not express the ER, PR, or HER2 are referred to as “triple-negative breast cancers” (TNBC) which is well-thought-out to be the most antagonistic [1, 28–30].