Meta-Analysis of GnRH Antagonists for Advanced Prostate Cancer

Dryad hosts a systematic review and meta-analysis of 13 clinical studies comparing gonadotropin-releasing hormone antagonists to standard androgen suppression therapy for advanced prostate cancer. The analysis, led by Frank Kunath and an international team including the German Cochrane Centre, extracted data on outcomes like overall mortality, treatment failure, and prostate-specific antigen progression up to March 2015. It includes safety data from non-randomized studies and assesses evidence quality using the GRADE framework.

Use Cases

• Compare overall mortality risk ratios (RR) between GnRH antagonists and standard therapy across 13 included studies.
• Analyze treatment failure and prostate-specific antigen progression outcomes using extracted relative risk data.
• Evaluate quality of life differences related to prostate symptoms using International Prostate Symptom Score (IPSS) mean score differences.
• Assess the risk of injection-site events and cardiovascular events from safety data in randomized and non-randomized studies.

Strengths

• Analysis is based on 13 included clinical studies (10 RCTs, 3 non-RCTs), providing a structured evidence base.
• Outcomes are quantified with specific metrics like relative risk (RR) and 95% confidence intervals for mortality and treatment failure.
• Evidence quality for all assessed outcomes is explicitly rated using the standardized GRADE framework.

Limitations

• The evidence is limited to 13 studies, with the quality rated as low for all outcomes according to GRADE.
• Available evidence is hampered by risk of bias, selective reporting, and limited follow-up as noted in the review.
• No study reported key clinical endpoints like cancer-specific survival or clinical progression.

Provenance

Source

Frank Kunath and an international review team including the German Cochrane Centre.

Collection Method

Systematic review and meta-analysis of data extracted from CENTRAL, MEDLINE, Web of Science, EMBASE, trial registries, and conference books up to March 2015.

Time Range

Literature search up to March 2015.

Freshness

null

Geography

International (studies sourced from global databases).