Abstract
After curative local therapy, biochemical recurrence is a mode of relapse among patient with prostate cancer (PC). Deferring androgen deprivation therapy (ADT) or offering non-hormonal therapies may be an appropriate option for these non-symptomatic patients with no proven metastases. Metronomic cyclophosphamide (MC) has shown activity in metastatic PC setting and was chosen to be assessed in biochemical relapse. This prospective single-arm open-label phase II study was conducted to evaluate MC regimen in patients with biochemical recurrent PC. MC was planned to be administered orally at a daily dose of 50 mg for 6 months. Primary endpoint was PSA response. Thirty-eight patients were included and treated. Median follow-up was 45.5 months (range 17–100). Among them, 14 patients (37 %) achieved PSA stabilisation and 22 patients (58 %) experienced PSA progression. Response rate was 5 % with one complete response (2.6 %), and 1 partial response with PSA decrease >50 % (2.6 %). The median time until androgen deprivation therapy initiation was around 15 months. The treatment was well tolerated. Neither grade 3–4 toxicity nor serious adverse events were observed. This first prospective clinical trial with MC therapy in patients with non-metastatic biochemical recurrence of PC displayed modest efficacy when measured with PSA response rate, without significant toxicity. It might offer a new safe and non-expensive option to delay initiation of ADT. These results would need to be confirmed with larger prospective randomised trials.
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Dr. Calcagno has nothing to disclose. Dr. Mouillet reports non-financial support from JANSSEN, personal fees from ASTELLAS, personal fees and non-financial support from Sanofi, during the conduct of the study. Pr. Adotevi has nothing to disclose. Dr. Maurina has nothing to disclose. Dr. Nguyen has nothing to disclose. Dr. Montcuquet has nothing to disclose. Dr. Curtit has nothing to disclose. Pr. Kleinclauss has nothing to disclose. Pr. Pivot has nothing to disclose. Pr. Borg reports grants from Roche, grants and personal fees from Sanofi, personal fees from Cellgen, personal fees from Lilly, outside the submitted work. Dr. Thiery-Vuillemin board membership + expert testimony = novartis, roche, ipsen, sanofi, takeda, pfizer, ferring.
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Calcagno, F., Mouillet, G., Adotevi, O. et al. Metronomic cyclophosphamide therapy in hormone-naive patients with non-metastatic biochemical recurrent prostate cancer: a phase II trial. Med Oncol 33, 89 (2016). https://doi.org/10.1007/s12032-016-0806-0
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DOI: https://doi.org/10.1007/s12032-016-0806-0