Outcomes in Patients with Muscle-invasive Bladder Cancer Treated with Neoadjuvant Chemotherapy Followed by (Chemo)radiotherapy in the BC2001 Trial

Abstract

Background: BC2001 demonstrated improved local control with the addition of chemotherapy to radiotherapy in 360 patients with muscle-invasive bladder cancer.

Objective: To establish whether such benefit remained in BC2001 patients who received prior neoadjuvant chemotherapy.

Design, setting, and participants: A total of 117 patients (33%) received neoadjuvant chemotherapy and were randomised to radiotherapy with (48%) or without (52%) concomitant chemotherapy. Patients were recruited between August 2001 and April 2008 from 28 UK centres.

Intervention: Platinum-based neoadjuvant chemotherapy, followed by radiotherapy with (cRT) or without (RT) synchronous 5-fluorouracil and mitomycin-C.

Outcome measurements and statistical analysis: Toxicity, locoregional control (LRC), overall survival (OS), and quality of life (QoL) were measured.

Results and limitations: Of the patients, 74% received gemcitabine plus cisplatin or carboplatin. Compliance rates with full-dose radiotherapy were cRT 93% and RT 92%. An excess of grade ≥3 toxicities while on (chemo)radiation occurred for cRT 33% versus RT 22%, although nonstatistically significant (p = 0.16). With 110 mo median follow-up for survival (interquartile range 96-123), cRT showed improved LRC though not statistically significant (adjusted hazard ratio [aHR] = 0.64, 95% confidence interval [CI] 0.33-1.23, p = 0.18). No differences in OS (aHR = 0.95, 95% CI 0.57-1.57, p = 0.8) were observed. No significant detriment in QoL was observed between cRT and RT in this subgroup of patients.

Conclusions: Neoadjuvant chemotherapy does not compromise the delivery of radical curative treatment. Although underpowered due to a small sample size, the benefit of chemoradiotherapy to improve local control in this group of patients receiving neoadjuvant chemotherapy is consistent with that observed in the main trial. Although a nonsignificant excess of toxicity was observed, there was no evidence of impaired QoL.

Patient summary: Chemotherapy before radical chemo(radiotherapy) is feasible and well tolerated.

Keywords: BC2001 trial; Chemoradiotherapy; Muscle-invasive bladder cancer; Neoadjuvant chemotherapy; Randomised controlled trial.