Combining imaging and ureteroscopy variables in a preoperative multivariable model for prediction of muscle‐invasive and non‐organ confined disease in patients with upper tract urothelial carcinoma
2012
Study Type – Diagnostic (exploratory cohort)
Level of Evidence 2b
What’s known on the subject? and What does the study add?
Improved patient selection for conservative management, neoadjuvant chemotherapy, and/or extended lymphadenectomy is urgently needed. We developed a highly accurate preoperative model to predict muscle-invasive and non-organ-confined upper tract urothelial carcinoma based on standard imaging and ureteroscopy features.
OBJECTIVE
• To create a preoperative multivariable model to identify patients at risk of muscle-invasive (pT2+) upper tract urothelial carcinoma (UTUC) and/or non-organ confined (pT3+ or N+) UTUC (NOC-UTUC) who potentially could benefit from radical nephroureterectomy (RNU), neoadjuvant chemotherapy and/or an extended lymph node dissection.
PATIENTS AND METHODS
• We retrospectively analysed data from 324 consecutive patients treated with RNU between 1995 and 2008 at a tertiary cancer centre.
• Patients with muscle-invasive bladder cancer were excluded, resulting in 274 patients for analysis.
• Logistic regression models were used to predict pT2+ and NOC-UTUC. Pre-specified predictors included local invasion (i.e. parenchymal, renal sinus fat, or periureteric) on imaging, hydronephrosis on imaging, high-grade tumours on ureteroscopy, and tumour location on ureteroscopy.
• Predictive accuracy was measured by the area under the curve (AUC).
RESULTS
• The median follow-up for patients without disease recurrence or death was 4.2 years.
• Overall, 49% of the patients had pT2+, and 30% had NOC-UTUC at the time of RNU.
• In the multivariable analysis, only local invasion on imaging and ureteroscopy high grade were significantly associated with pathological stage.
• AUC to predict pT2+ and NOC-UTUC were 0.71 and 0.70, respectively.
CONCLUSIONS
• We designed a preoperative prediction model for pT2+ and NOC-UTUC, based on readily available imaging and ureteroscopic grade.
• Further research is needed to determine whether use of this prediction model to select patients for conservative management vs RNU, neoadjuvant chemotherapy, and/or extended lymphadenectomy will improve patient outcomes.
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