ROBO1 and familial pancreatic carcinoma: Examinations of the SLIT2 and ROBO1 expression levels in 10 pancreatic cancer cell lines revealed that SLIT2 seldom displays high expression in PDAC cell lines, especially in liver metastasis-derived CAPAN-1 and cFPAC-1 cells with relatively high ROBO1 expression (Supplementary Fig. 13a, b).