New Practice Guideline for Systemic Therapy in Men with Metastatic Prostate Cancer
Anew guideline for systemic therapy in men with metastatic castration-resistant prostate cancer (mCRPC) is based on a literature review of recent publications and outlines the survival and quality-of-life benefits/toxicity effects of each recommendation (Basch E, et al. J Clin Oncol. 2014 Sept 8. Epub ahead of print).
Jointly issued by the American Society of Clinical Oncology (ASCO) and Cancer Care Ontario (CCO), the new guideline considers new systemic therapies for mCRPC, including abiraterone acetate (Zytiga), enzalutamide (Xtandi), and radium-223 (Xofigo).
“Something different about this guideline is that quality of life and toxicity have been elevated in the recommendations themselves—the patient experience is prioritized,” lead investigator Ethan Basch, MD, MSc, Co-Chair of the ASCO/CCO Expert Panel that developed the guideline, and Associate Professor of Medicine and Public Health, University of North Carolina at Chapel Hill, told Value-Based Cancer Care. “In addition, the strength of the evidence and the strength of the recommendations are transparent.”
The new document builds on previous guidelines and a review of 25 new randomized, controlled trials. According to the new recommendations:
- Continuous androgen-deprivation therapy (ADT) via medication or surgery should be continued indefinitely, even if other therapies are added (benefit: moderate; harm: moderate; evidence: weak; recommendation: moderate)
- Abiraterone acetate + prednisone, radium-223 in men with primarily bone metastases, or enzalutamide should be used in addition to ADT (all—benefit: moderate; harm: low; evidence: strong; recommendation: strong)
- Docetaxel (Taxotere) + prednisone also should be used in addition to ADT (benefit: moderate; harm: moderate; evidence: strong; recommendation: moderate)
- Other therapies to consider:
- Sipuleucel-T (Provenge) in asymptomatic or in minimally symptomatic men
- Cabazitaxel (Jevtana) and prednisone in men whose disease has progressed with docetaxel
- Mitoxantrone (Novantrone) + prednisone
- Antiandrogens, such as bicalutamide (Casodex), flutamide (Eulexin), or nilutamide (Nilandron)
- Low-dose corticosteroid monotherapy
- Bevacizumab (Avastin), estramustine (Emcyt), and sunitinib (Sutent) should not be used, because they do not increase survival or improve quality of life
- Palliative care should be offered to all patients receiving any treatment, particularly those with symptoms or quality-of-life reduction.
He noted that cost and cost-effectiveness were not taken into consideration in the recommendations, although cost was included in a table in the guideline and in the discussion. Dr Basch said it is important to have more postmarketing data to continue to ascertain the rate of serious adverse events in clinical practice. The team also did not recommend particular sequences or drug combinations, because of an insufficient evidence base for that, he said.