THBS1 and neoplasm: Among these, CD273 and CD146 may indeed be MSC-specific, whereas CD36 (a receptor for thrombospondin-1) [45], CD200 (also expressed on tumor cells) [46], CD274 (PDL-1) [47], and CD248 (endosialin) [48] are also expressed in fibroblasts, often in a tumor context.