Survival outcomes improve with 4 cycles of neoadjuvant gemcitabine plus cisplatin rather than 3 cycles in patients with localized muscle-invasive bladder cancer (MIBC), according to a study in Urologic Oncology.

In this retrospective study, investigators compared 107 patients (64.5%) who received 3 cycles and 59 patients (35.5%) who received 4 cycles of neoadjuvant gemcitabine plus cisplatin prior to radical cystectomy. Tumor histology and tumor stage were similar between the 2 groups. Age, insurance status, and comorbidity burden were also comparable.

Disease response did not differ significantly between groups. Complete response or downstaging occurred in 21.5% and 40.2% of the 3-cycle group, respectively, and 20.3% and 44.1% of the 4-cycle group, respectively.


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Patients in the 4-cycle group had a significant 88% greater likelihood of overall survival compared with those in the 3-cycle group, however. Cancer-specific survival was a nonsignificant 69% higher in the 4-cycle group than in the 3-cycle group.

According to the investigators, neoadjuvant chemotherapy may be especially effective against micrometastatic disease.

“Although potential benefits of omission of fourth cycle may include expedited time to surgery, reduced chemotherapy-associated toxicity, and lower treatment costs, continuation of treatment with a fourth cycle of neoadjuvant [gemcitabine plus cisplatin] chemotherapy may benefit patients with muscle-invasive bladder cancer and further improve disease outcomes,” the investigators concluded.

The study is limited by its retrospective design, which is subject to selection bias. Randomized controlled data are still needed.

Reference

Murat Aydin A, Cheriyan SK, Reich R, et al. Comparative analysis of three vs. four cycles of neoadjuvant gemcitabine and cisplatin for muscle invasive bladder cancer. Urol Oncol. Published online July 7, 2022. doi:10.1016/j.urolonc.2022.05.023

This article originally appeared on Renal and Urology News