CD34 and neoplasm: The main findings are (a) the coincidental location and arrangement of normal breast CD34+SCs/TCs and tumour stromal cells, which may act as a guide for neoplastic cells, giving rise to specific morphological growth patterns, such as the typical concentric rings of neoplastic cells around normal ducts a fact of diagnostic interest, and (b) the presence of tumoral areas with stromal cells that coexpress CD34 and αSMA.