Screening for the FIG-ROS1 fusion in biliary tract carcinomas by nested PCR.

rearrangements have been detected in a variety of tumors and are considered as suitable targets of anticancer therapies. We developed a new, quick, specific, and sensitive PCR test to screen for the fusion and applied it to a series of Italian patients with bile duct carcinoma (BTC). Formalin-fixed, paraffin-embedded tissues, derived from 65 Italian BTC patients, and six cell lines were analyzed by nested PCR to investigate the prevalence of a previously reported FIG-duanyu16701 fusion. The specificity and sensitivity of nested PCR were investigated in FIG-duanyu16701 positive U118MG cells in reconstitution experiments with peripheral blood mononuclear cells. We found that six out of 65 (9%) BTC patients were positive for the FIG-duanyu16701 fusion, comprising two out of 14 (14%) gallbladder carcinoma (GBC) patients and four out of 25 (16%) extrahepatic cholangiocarcinoma (ECC) patients. None of the 26 intrahepatic cholangiocarcinoma cases harbored the FIG-duanyu16701 fusion. All the cell lines were negative for this variant. In conclusion, 14-16% of GBC and ECC were positive for This may have clinical implications, since these patients will potentially benefit from the treatment with specific duanyu16701 inhibitors.

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