ERBB2 and cancer: The goals of the current study were to prepare QD-encoded microcapsules, to estimate their in vitro biocompatibility and to develop an approach to bio-functionalization of the QD-encoded microcapsules with mAbs, Trastuzumab, targeting the extracellular domain of the human epidermal growth factor receptor 2 (HER2) and determine whether the designed conjugates specifically interact with cancer cells.