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Purpose The role of carbohydrate antigen 19-9 (CA19-9) kinetics in patients with biliary tract cancer (BTC) receiving chemotherapy remains to be elucidated. Methods A total of 185 advanced or recurrent BTC patients receiving a first line chemotherapy between January 2006 and March 2016, were retrospectively studied. Serum CA19-9 was measured at baseline and after two cycles of chemotherapy, and...
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