Krampitz and collaborators identified acell population with high expression of CD90 (a marker of hematopoietic stem cells)in patient-derived primary tumors, which overlapped with enhanced expression ofALDHA1, upregulation of stem cell genes, and increased xenograft tumor development,thus highlighting these CD90-positive cells as putative tumor-initiating cellsand/or potential CSCs in low-grade PanNETs (Krampitz et al. 2016). Here, THY1 is linked to neoplasm.