Effect of consumer reporting on signal detection: using disproportionality analysis.

Area of Science:

• Pharmacovigilance and Drug Safety
• Regulatory Science
• Public Health

Background:

• Spontaneous adverse event reports (SADRs) are crucial for pharmacovigilance, aiming to protect consumer health.
• While healthcare professionals were the intended source, consumers are now the most frequent reporters of SADRs.
• Pharmaceutical companies like GSK use signal detection methods, such as multiple-item gamma-Poisson shrinker (MGPS) disproportionality analysis, for safety surveillance.

Purpose of the Study:

• To evaluate the impact of consumer-submitted adverse event reports on the early detection of safety signals.
• To compare signal detection timelines using data sets with and without consumer reports.

Main Methods:

• A study was conducted using two datasets for four randomly selected GlaxoSmithKline (GSK) marketed compounds.
• One dataset included reports from both consumers and healthcare providers; the second included only healthcare provider reports.
• Disproportionality analysis, specifically MGPS, was applied to both datasets to identify safety signals.

Main Results:

• A total of 23 safety signals were identified across the datasets.
• Including consumer reports led to earlier signal detection in 52.2% of events (12/23), with a mean difference of 1.8 years.
• In 34.8% of events (8/23), signals were detected in the same year, and in 13% (3/23), signals were detected later with consumer data.

Conclusions:

• Adverse event reports directly from consumers can significantly enhance the early detection of safety signals.
• Integrating consumer reports into pharmacovigilance systems improves the timeliness of identifying potential drug safety issues.
• This study highlights the value of consumer-generated data in strengthening drug safety surveillance.