Abstract: Methods of tests that assess the expression of DPC4 (SMAD4) to identify subjects with pancreatic cancer that are likely or unlikely to respond to treatment with BTK inhibitors; methods of treating subjects based on identification of the subjects as likely to respond to treatment with BTK inhibitors; therapeutic targets for cancers, particularly cancers with inactivated DPC4 gene or protein; methods of screening of new therapeutic agents using the target; pharmaceutical composition comprising BTK inhibitors, such as PCI-32765 or derivatives thereof, for cancer treatment; and kits that facilitate the performance of the methods are disclosed.

Abstract: Methods of tests that assess the expression of DPC4 (SMAD4) to identify subjects with pancreatic cancer that are likely or unlikely to respond to treatment with BTK inhibitors; methods of treating subjects based on identification of the subjects as likely to respond to treatment with BTK inhibitors; therapeutic targets for cancers, particularly cancers with inactivated DPC4 gene or protein; methods of screening of new therapeutic agents using the target; pharmaceutical composition comprising BTK inhibitors, such as PCI-32765 or derivatives thereof, for cancer treatment; and kits that facilitate the performance of the methods are disclosed.