VCAM1 and cancer: Cluster 14 could be labeled with CD44, VCAM1, and TAGLN genes, which are expressed in both MSCs and fibroblasts so that Cluster14 may also comprise MSCs or fibroblasts (hereinafter, undefined cells-2).[19–24] In Section 3.3.2, we knew cluster 7 comprised cancer-associated fibroblasts (CAFs) and cluster 14 consisted of MSCs.