The aim of this retrospective study is to evaluate the activity and safety of a steroidal switch from prednisone to dexamethasone in patients with advanced, heavily pre-treated, castration-resistant prostate cancer (CRPC) who progressed on abiraterone acetate. Treatment consisted of oral daily abiraterone plus dexamethasone (0.5 mg once daily) administered until disease progression or unacceptable toxicity. Thirty-six patients were evaluated: all men underwent a prior treatment with enzalutamide. A PSA decrease ≥50% was observed in 11% of patients; median progression-free survival was 10.8 weeks (95% CI: 9.2-16), and median survival was 17.6 weeks (95% CI: 15.8-28.8). Better efficacy and survival were observed in the subgroup of patients treated with abiraterone acetate prior for a period >3 months; treatment was well tolerated, and no grade 3-4 toxicities were observed. Our findings did not suggest the use of steroid switch in all CRPC who were heavily pre-treated. However, the switch could be an option for patients who responded well to prior abiraterone acetate treatment.
Investigational new drugs. 2018 Oct 22 [Epub ahead of print]
Giandomenico Roviello, Roberto Petrioli, Alberto Bonetta, Raffaele Conca, Maria Grazia Rodriquenz, Michele Aieta
Division of Medical Oncology, Department of Onco-Hematology, IRCCS-CROB, Referral Cancer Center of Basilicata, via Padre Pio 1, 85028 Rionero, Vulture, PZ, Italy. ., Department of Medicine, Surgery and Neurosciences, Medical Oncology Unit, University of Siena, Viale Bracci - Policlinico "Le Scotte", 53100, Siena, Italy., Radiotherapy Department, ASST Cremona, Viale Concordia 1, 26100, Cremona, Italy., Division of Medical Oncology, Department of Onco-Hematology, IRCCS-CROB, Referral Cancer Center of Basilicata, via Padre Pio 1, 85028 Rionero, Vulture, PZ, Italy.