Differentiating Upper Tract Urothelial Carcinoma with Synchronous or Metachronous Bladder Cancer

Area of Science:

• Urology
• Oncology
• Pathology

Background:

• Multiple urothelial tumors present diagnostic and prognostic challenges.
• Differentiating synchronous and metachronous upper tract urothelial carcinoma with bladder cancer (UTUC + sUBC vs. UTUC + mUBC) may reveal distinct biological processes.

Purpose of the Study:

• To compare the clinical, phenotypic, and genomic features of synchronous versus metachronous UTUC-UBC.
• To determine if temporal patterns in urothelial carcinoma reflect biologically distinct processes.

Main Methods:

• Retrospective subgroup analysis of 114 UTUC patients.
• Comparison of UTUC + sUBC (n=14) and UTUC + mUBC (n=29) cohorts.
• Immunohistochemistry (CK5/6, CK20, GATA3, p53) and genetic analysis (TERTp, FGFR3, RAS, TP53).

Main Results:

• No significant differences in phenotype or genomic profiles between synchronous and metachronous UTUC-UBC.
• Synchronous UBC patients showed significantly worse 2-year progression-free survival (23.1% vs. 52.1%, p=0.029).
• Synchronous UBC patients exhibited significantly worse 2-year overall survival (40.4% vs. 84.4%, p=0.016).

Conclusions:

• Synchronous and metachronous UTUC-UBC share similar molecular characteristics.
• The worse outcomes in synchronous UTUC-UBC may be due to uncharacterized molecular features or microenvironmental factors.