Co-expression of Pan-Ck, Ck-7 and PTX3 is restricted to a specific subset of cells (34.5% in PDAC#1; 43.7% in PDAC#3) (Figure 2F, white arrows and Figure 2G, red arrows), compared to the neighbor cells which lack the expression of Ck-7 (Figure 2F, white arrowheads and Figure 2G, red arrowheads), thus suggesting in an attempt to speculate the identification of subpopulation of PDAC cells associated with high tumor metastatic potential. The gene discussed is KRT7; the disease is neoplasm.