Long-term outcomes after bladder-preserving combined-modality therapy for patients with muscle-invasive bladder cancer.

Authors

null

Nicholas J Giacalone

Massachusetts General Hospital/Harvard Radiation Oncology Program, Boston, MA

Nicholas J Giacalone , Rebecca Helen Clayman , William U. Shipley , Andrzej Niemierko , Niall M. Heney , M Dror Michaelson , Francis J. McGovern , Donald S. Kaufman , Anthony L. Zietman , Jason A. Efstathiou

Organizations

Massachusetts General Hospital/Harvard Radiation Oncology Program, Boston, MA, Massachusetts General Hospital, Harvard Medical School, Boston, MA, Massachusetts General Hospital, Boston, MA, Massachusetts General Hospital Cancer Center, Boston, MA

Research Funding

No funding sources reported

Background: Transurethral resection of bladder tumor (TURBT), chemotherapy (CT), and radiation therapy (RT) is an established treatment paradigm for muscle-invasive bladder cancer (MIBC). Herein we report long-term outcomes for MIBC patients treated with combined-modality therapy (CMT). Methods: We analyzed 465 patients with MIBC (cT2-T4a) treated on successive protocols at a single center between 1986 and 2012. Patients underwent TURBT followed by concurrent cisplatin-based chemoradiation (CRT). A subset of patients received neoadjuvant CT. Repeat cystoscopy was performed after 40 Gy. Patients with a complete response (CR) received consolidation CRT to 64-65 Gy, while those with less than a CR or invasive recurrence were recommended to undergo salvage RC. Overall survival (OS) and disease-specific survival (DSS) were evaluated using Kaplan-Meier method and Cox proportional hazards regression. Results: Median follow-up was 4.8 years for all patients and 7.5 years for surviving patients. CR to induction CRT was achieved in 76% patients; 84% of patients with a complete TURBT achieved a CR vs. 59% with an incomplete TURBT, p< 0.001. When evaluated in four-year intervals, the CR rate improved from 64% in 1986-1990 to 96% in 2010-2012. Salvage RC was performed in 125 patients (27%), 55 for less than CR and 70 for superficial or invasive recurrence. Among patients with a CR, the 10-year actuarial rates for non-invasive, invasive, pelvic, and distant failure were 32%, 16%, 14%, and 29%, respectively. Median OS was 6.4 years. Five- and 10-year OS rates were 57% and 39% (T2 = 66%, 46%; T3-T4a = 41%, 26%), respectively. Five- and 10-year DSS rates were 66% and 59% (T2 = 75%, 66%; T3-T4a = 50%, 45%), respectively. In multivariate analyses, T2 disease (vs. T3-4; HR 0.55, 95%CI 0.40-0.76) and CR to induction therapy (HR 0.40, 95%CI 0.28-0.55) were significant predictors for improved OS. Age was not associated with DSS (HR 1.01, 95%CI 0.99-1.03). Conclusions: These data support the high rates of CR and bladder preservation in patients receiving CMT, and demonstrate long-term DSS similar to modern cystectomy series. CMT should be considered as an alternative treatment strategy for selected patients with MIBC.

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Abstract Details

Meeting

2016 Genitourinary Cancers Symposium

Session Type

Poster Session

Session Title

Poster Session B: Prostate Cancer; Urothelial Carcinoma; Penile, Urethral, and Testicular Cancers

Track

Urothelial Carcinoma,Prostate Cancer,Penile, Urethral, and Testicular Cancers

Sub Track

Urothelial Carcinoma

Citation

J Clin Oncol 34, 2016 (suppl 2S; abstr 398)

DOI

10.1200/jco.2016.34.2_suppl.398

Abstract #

398

Poster Bd #

G11

Abstract Disclosures