THY1 and neoplasm: Although a different tri-mesenchymal differentiation capacity was noticed between CD90+ and CD90− populations, as indicated by adipocyte differentiation only in cells lacking CD90, this data is preliminary and further experiments, optimizing the expansion of MSC clones from a larger number of tumor samples, is warranted in order to confirm if the absence of adipocyte differentiation is a distinctive feature of CD90+ cell population.