Use of administrative data for comparative effectiveness research in the treatment of non-prostate genitourinary malignancies

Nephroureterectomy vs. segmental ureterectomy of clinically localized, high-grade, urothelial carcinoma of the ureter: Practice patterns and outcomes

BACKGROUND

Nephroureterectomy (NU) remains the gold-standard for upper-tract urothelial carcinoma (UTUC). However, nephron-sparing management (NSM), specifically segmental ureterectomy (SU) for urothelial tumors distal to the renal pelvis may offer decreased risk of renal insufficiency and equivalent cancer control.

OBJECTIVES

To identify patient-specific and facility-related factors that are associated with the selection of SU vs. NU for patients with clinically localized, high-grade, ureteral UTUC.

DESIGN, SETTING, PARTICIPANTS

We searched the National Cancer Database between 2004 and 2015 for patients with high-grade, clinically localized, primary ureteral UTUC managed by either NU or SU.

OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS

Univariate and multivariate analysis was performed to assess patient, disease-specific, facility and treatment-related factors associated with SU vs. NU. Since surgical approach was only indexed after 2010, separate multivariable logistic regressions were performed including and excluding surgical approach in order to capture patients treated between 2004 and 2009. Survival analysis utilized Kaplan-Meier methods and Cox proportional hazards regression.

RESULTS AND LIMITATIONS

Multivariate analysis including surgical approach demonstrated that among other factors, higher clinical stage (P = 0.034), larger tumor size (P < 0.001), the addition of neoadjuvant chemotherapy (P = 0.002), and the utilization of minimally invasive surgery (P < 0.05) decreased the likelihood of patients receiving SU. In this same cohort, institutions with larger facility volumes (P = 0.038) and performing intraoperative lymph node dissection (P < 0.001) were associated with a higher probability of SU. Excluding surgical approach, once again more advanced clinical stage (P = 0.005), larger tumor size (P < 0.001), and neoadjuvant chemotherapy (P = 0.003) decreased the probability of patients receiving SU, while increasing age (P = 0.049) and intraoperative lymph node dissection (P < 0.001) were more closely associated with SU compared to NU. No differences were noted in pathological T stage (P > 0.05), 30-day readmission (P = 0.7), 30-day mortality (P = 0.09), and 90-day mortality (P = 0.157) on multivariate analysis between SU and NU. Additionally, no significant differences were seen in median overall survival between patients receiving SU or NU (53 vs. 50 months; P = 0.143).

CONCLUSIONS

Comparable outcomes suggest segmental ureterectomy for high-grade ureteral UTUC is appropriate in well-selected patients. Practice patterns appear consistent with guideline recommendations (decreased tumor size and lower clinical stage favor SU), but treatment disparities may exist based on a multitude of patient, pathologic- and facility-related factors. Improved dissemination of knowledge regarding practice patterns and outcomes of SU for UTUC of the ureter has the potential to improve delivery of NSM in appropriate patients.

PATIENT SUMMARY

In this study, we examined factors associated with different surgical procedures for cancer of the ureter. We found that smaller tumor sizes, a less advanced clinical stage, intraoperative lymph dissection higher facility volumes tended to favor kidney-sparing treatment, while survival outcomes appear comparable to renal extirpation.