To rule out cell line-specific effects, cocultures were performed with a panel of murine cancer cell lines (namely the mammary carcinoma cell line 4T1, the lung carcinoma cell line LL/2-EpCAM, the pancreatic ductal adenocarcinoma cell line T110299-EpCAM and the colon carcinoma cell line CT26-EpCAM). Here, EPCAM is linked to breast carcinoma.