Case Report: SMARCA4 (BRG1)-deficient undifferentiated carcinoma of gallbladder with genetic analysis.

-deficient undifferentiated carcinoma is a rare and highly aggressive malignancy. It has been reported to occur in a multiple range of organs. However, to the best of our knowledge, -deficient undifferentiated carcinoma of gallbladder has not yet been reported. Here, we describe a case of -deficient undifferentiated carcinoma of gallbladder. Through comprehensive genetic analysis, we hypothesized that in addition to deficiency, other genetic changes might also be involved in the tumorigenesis of undifferentiated gallbladder cancer in this patient, particularly somatic mutations in the , and genes. To the best of our knowledge, this is the first report of -deficient undifferentiated carcinoma of gallbladder with genetic analysis.