Tumour responses following a steroid switch from prednisone to dexamethasone in castration-resistant prostate cancer patients progressing on abiraterone.

http://www.nature.com/bjc/journal/v111/n12/pdf/bjc2014531a.pdf

Tumour responses following a steroid switch from prednisone to dexamethasone in castration-resistant prostate cancer patients progressing on abiraterone.

Lorente D1, Omlin A2, Ferraldeschi R1, Pezaro C1, Perez R1, Mateo J1, Altavilla A1, Zafeirou Z1, Tunariu N1, Parker C3, Dearnaley D3, Gillessen S4,de Bono J1, Attard G1.

Abstract

BACKGROUND:

Abiraterone is a CYP17A1 inhibitor that improves survival in castration-resistant prostate cancer (CRPC). Abiraterone is licensed in combination with prednisone 5 mg twice daily to prevent a syndrome of secondary mineralocorticoid excess. We hypothesised that a 'steroid switch' from prednisone to dexamethasone would induce secondary responses in patients progressing on abiraterone and prednisone 5 mg b.i.d.

METHODS:

We performed a 'steroid switch' in patients with CRPC at PSA progression on abiraterone and prednisolone. Patients were monitored for secondary declines in PSA, radiological tumour regression and toxicity.

RESULTS:

A retrospective analysis of 30 CRPC patients who underwent a steroid switch from prednisolone to dexamethasone while onabiraterone was performed. A total of six patients (20%) had a ⩾50% PSA decline that was confirmed by a second PSA level at least 3 weeks later. In all, 11 patients (39.2%) had a confirmed ⩾30% PSA decline. Median time to PSA progression on abiraterone anddexamethasone was 11.7 weeks (95% CI: 8.6-14.8 weeks) in the whole cohort and 27.6 weeks (95% CI: 14.5-40.7 weeks) in patients who achieved a confirmed 50% PSA decline. Nine patients had RECIST evaluable disease: two of these patients had RECIST partial response, six patients had stable disease and one patient had progressive disease at the first imaging assessment. Treatment was well tolerated, with no grade 3 and grade 4 adverse events. One patient had to be reverted to prednisolone because of grade 2 hypotension.

CONCLUSIONS:

Durable PSA responses occur in up to 40% of patients following a 'steroid switch' for PSA progression on abirateroneand prednisone. Studies are ongoing to elucidate the mechanisms underlying this response.

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