Histological variants of non–muscle invasive bladder cancer: Survival outcomes of radical cystectomy vs. bladder preservation therapy

Furkan Dursun, Ahmed Elshabrawy, Hanzhang Wang, Shenghui Wu, Michael A. Liss, Dharam Kaushik, Daniel Grosser, Robert S. Svatek, Ahmed M. Mansour

Research output: Contribution to journalArticlepeer-review

Abstract

Background: To compare the overall survival (OS) outcomes of non–muscle invasive bladder cancer (NMIBC) patients with variant histology who underwent radical cystectomy (RC) vs. bladder preservation therapy (BPT). Methods: We investigated the National Cancer Database for NMIBC patients with variant histological features. Patients diagnosed with micropapillary, sarcomatoid, neuroendocrine, squamous, and glandular variants were identified. Inverse probability weighting (IPW)-adjusted Kaplan Meier survival curves and Cox proportional hazard models were utilized to compare OS in the setting of RC versus BPT. Results: A total of 8,920 (2.7%) NMIBC patients presented with variant histology, of whom 2,450 (27.5%) underwent RC, while 6,470 (72.5%) had BPT. When compared with BPT, patients who underwent RC had significantly higher 5-year OS rates for sarcomatoid (31.9% vs. 23.3%, P < 0.001) neuroendocrine (31% vs. 21.7%, P < 0.001), glandular (44% vs. 41%, P = 0.04) and squamous variants (39.7% vs 19.9%, P < 0.001). This OS benefit was not observed with micropapillary variant (43.9% vs. 53.2% P = 0.14). IPW-adjusted log-rank analysis identified RC as an independent predictor of OS for patients with sarcomatoid (hazards ratio [HR] 0.78, confidence interval [CI] 0.71–0.85, P < 0.001), squamous (HR 0.56, CI 0.53–0.59, P < 0.001), and neuroendocrine variants (HR 0.83, CI 0.76–0.91, P < 0.001), but not for micropapillary variant (HR 1.45, CI 1.24–1.7, P < 0.001). Conclusions: Among NMIBC patients presenting with variant histologies, RC was associated with better OS for sarcomatoid, squamous, glandular, and neuroendocrine variants when compared to BPT. This OS survival benefit was not observed in patients with micropapillary variant suggesting a potential role for bladder preservation in such population.

Original languageEnglish (US)
Pages (from-to)275.e1-275.e10
JournalUrologic Oncology: Seminars and Original Investigations
Volume40
Issue number6
DOIs
StatePublished - Jun 2022

Keywords

  • Bladder preservation
  • Non-muscle invasive bladder cancer
  • Radical cystectomy
  • Survival
  • Variant histology

ASJC Scopus subject areas

  • Oncology
  • Urology

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