CD44 and neoplasm: Tumor cells (n=38284; 31.2%, n=8; range 22.5-37.2% per PDAC) were annotated into 7 different subtypes, based on the expression of Pan-Ck, cytokeratin 7 (Ck-7), CD44, S100A4, PTX3, CA-IX, CD74 (Figures 2A, B).