COL1A1 and neoplasm: To begin to determine what might be the role of CCN1 expression by CAFs, we used CAF single-cell expression data to identify a group of six genes (PDGFRA, COL1A1, DCN, TAGLN, COL6A3, and LPAR1) that strongly correlated with CCN1 expression, yet were minimally expressed in other tumor cell types.