CD68 and cholangiocarcinoma: Larger clusters of CD68+ cells detected in Cluster 2 were restricted to primary liver tumors and were in case of CCA and pCCA significantly different in comparison to the control group (Control vs. CCA: p = 0.0265, Control vs. pCCA: p = 0.0057) and the group of secondary liver tumors (CRLM vs. CCA: p = 0.0489, CRLM vs. pCCA: p = 0.0109).