SLC14A1 (UT-B) gene rearrangement in urothelial carcinoma of the bladder: a case report

Abstract

Background Bladder cancer (BC) is a common and deadly disease. Over the past decade, a number of genetic alterations have been reported in BC. Bladder urothelium expresses abundant urea transporter UT-B encoded by Slc14a1 gene at 18q12.3 locus, which plays an important role in preventing high concentrated urea-caused cell injury. Early genome-wide association studies (GWAS) showed that UT-B gene mutations are genetically linked to the urothelial bladder carcinoma (UBC). In this study, we examined whether Slc 14a1 gene has been changed in UBC, which has never been reported. Case presentation A 59-year-old male was admitted to a hospital with the complaint of gross hematuria for 6 days. Ultrasonography revealed a size of 2.8 × 1.7 cm mass lesion located on the rear wall and dome of the bladder. In cystoscopic examination, papillary tumoral lesions 3.0-cm in total diameter were seen on the left wall of the bladder and 2 cm to the left ureteric orifice. Transurethral resection of bladder tumor (TURBT) was performed. Histology showed high-grade non-muscle invasive UBC. Immunostaining was negative for Syn, CK7, CK20, Villin, and positive for HER2, BRCA1, GATA3. Using a fluorescence in situ hybridization (FISH), Slc14a1 gene rearrangement was identified by a pair of break-apart DNA probes. Conclusions We for the first time report a patient diagnosed with urothelial carcinoma accompanied with split Slc14a1 gene abnormality, a crucial gene in bladder.

HER2 Overexpression In Urothelial Carcinoma Is Closely Associated With Disease Progression: A Single-Center Retrospective Study

“…UBC is more likely to recur than any other solid tumor, which is an important clinical feature of UBC. Once diagnosed, more than 70% of patients will have a recurrence during the rst 2 years, and the tumor grade and/or stage are higher after recurrence, which results in a poor prognosis for the patient [17]. UTUC, which accounts for about 5%-10% of all UC, is relatively rare, but this tumor is generally more aggressive and has a worse prognosis than UBC [18].…”