CD34 and neoplasm: Consequently, studying the stromal cell population (CD34+SCs/TCs and myofibroblasts) during repair, including tumor stroma formation as a special type of repair, in different areas of an organ, can reveal whether the response depends on (a) the regional presence or absence of CD34+SCs/TCs (general role of CD34+SCs/TCs in repair) and (b) the area in which these cells are located (different role of CD34+SCs/TCs subpopulations depending on location).