CCL2 and pachyonychia congenita: We examined CCL2 levels in a wild-type PC cell line (DU145), a DTX-resistant PC cell line (DU145-TxR), and a CBZ-resistant PC cell line (DU145 TxR/CxR), and found that DU145-TxR and DU145 TxR/CxR had significantly higher CCL2 levels than DU145 [37].