AI Article Synopsis

  • The study aimed to evaluate how accurately ureteroscopic (URS) biopsies can predict the stage and grade of upper tract urothelial carcinoma (UTUC) based on final pathology results.
  • The results from 23 studies involving 3547 patients show that while high-grade tumors have a high predictive value (97%) in URS biopsies, there are significant rates of undergrading (32%) and understaging (46%) for low-grade and non-muscle-invasive diseases.
  • The research concludes that while URS biopsies can be fairly reliable for identifying high-grade tumors and invasive disease, there is a notable risk for misclassification, which should be considered in clinical assessments.

Article Abstract

Objective: To assess the accuracy of ureteroscopic (URS) biopsies in predicting stage and grade at final pathology in upper tract urothelial carcinoma (UTUC).

Materials And Methods: The meta-analysis was performed in accordance with the PRISMA statement. Studies providing data on tumor stage and grade at URS biopsy and surgical specimens were included. The negative predictive value (NPV) implies concordance between the absence of subepithelial connective tissue invasion or the presence of low-grade tumors at URS biopsy and the absence of a muscle-invasive disease in the final pathology.

Results: A total of 23 studies were included (3547 patients). The stage-to-stage match between URS biopsy/final pathology showed a positive predictive value (PPV) for cT1+/muscle-invasive disease of 94% (95% CI: 84%-100%) and a NPV for cTa-Tis/non-muscle-invasive disease of 60% (95% CI: 52%-68%). The grade-to-grade match between URS biopsy/final pathology was 66% (95% CI: 55%-77%) for low-grade (cLG/pLG) tumors and 97% (95% CI: 94%-98%) for high-grade (cHG/pHG) tumors. The PPV for cHG/muscle-invasive disease was 60% (95% CI: 54%-66%) and the NPV for cLG/non-muscle-invasive disease was 77% (95% CI: 73%-82%). The undergrading and understaging rates were 32% (95%CI: 25%-38%) and 46% (95% CI: 38%-54%), respectively.

Conclusions: There is a substantial correlation between tumor grade at URS biopsy and the final pathology. The identification of cHG tumors and subepithelial connective tissue invasion (cT1+) in URS biopsy showed a moderate and a strong correlation with invasive UTUC, respectively. Nevertheless, a certain risk of undergrading and understaging should be assumed.

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Source
http://dx.doi.org/10.1016/j.ejso.2020.06.024DOI Listing

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