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Clinical Trials

Clinical trials are an essential step in the medicine development process.

 

What is a clinical trial?

A clinical trial is a research study that explores whether a medical treatment or device is safe and effective for humans. It plays a critical role in the process of bringing new therapies to patients.
 
It typically takes 12 years for a potential new therapy to gain approval for use with patients.1 And trials conducted during clinical development generate thousands of pieces of data that are generally used by regulatory agencies, to determine approval for use of the therapy and in which medical indications.

 

Patient Volunteers

Clinical trials rely on hundreds to many thousands of volunteer trial participants. For patients suffering from a condition that is currently untreatable, enrollment in a clinical trial may provide access to potential new therapies. While participating, volunteers are closely monitored by trial researchers, and their involement in such trials will help others by contributing to medical research. Every trial is governed using well-defined ethical rules and standards to protect participant safety.

 


 

Clinical Trial Process

 
Pre-clinical studies2

Before testing on humans, early trials are carried out on the most promising molecules, using computer simulations (in solico studies), cell-based tests (in vitro studies) and animal tests (in vivo studies). Only if the moelcule meets specific safety standards and demostrates value as a potential new therapy does it progress to clinical testing in humans, known as 'Phases'.

 

Phase 1: 20-100 healthy volunteers2

Phase 1 trials usually focus on ensuring the therapy is safe to use in people, rather than how effective it may be as a treatment for a given disease. During this phase, escalating doses of the experimental therapy are given to a small number of study participants so that researchers can measure the body’s response, including how it is absorbed, its duration in the bloodstream, and which dosage levels are safe and well tolerated.3

 

Phase 2: 100-500 patients with the disease2

Phase 2 trials generally assess the effectiveness of an experimental therapy at treating a specific illness or medical condition.3

Information about the experimental therapy's safety, side effects, and potential risks are also collected. In this phase, researchers work to determine the most effective dosages for the experimental therapy and the most appropriate method of delivery, such as tablets, extended-release capsules, infusions, or injections. Phase 2 clinical trials involve a larger number of trial participants, typically up to several hundred, who usually have the medical condition that the experimental therapy is intended to treat.

 

Phase 3: 1,000 - 5,000 patients2

Phase 3 trials test the results of earlier trials in much larger groups of people and gather additional information on the effectiveness and safety of the experimental therapy.
 
This phase will usually involve several hundred to several thousand participants across multiple study locations. These trials are often randomized, where participants are randomly allocated to receive the experimental therapy, placebo, or an existing treatment. Trials are often "double-blinded" in which neither the investigator nor the participant are aware if the therapy given is the true experimental therapy, placebo, or an existing therapy.3 Phase 3 trials generally provide the primary basis for the benefit–risk assessment for the new therapy and much of the core information about the therapy that is analysed for inclusion in final labeling if approved by the regulatory authority.

 

Licensing approval

Results from clinical trials are submitted to regulatory agencies to obtain a licence prior to it being made available to patients. The European Medical Agency (EMA) is responsible for regulatory approval of new drugs within the European union (EU), whist the Medicines and Healthcare products Regulatory Agency (MHRA) is responsible within the UK. After a drug has been approved by the EMA or MHRA, the National Institute of Clinical Excellence (NICE) decides whether a drug should be made widely available on the NHS.

 

Phase 4

Also known as "postmarketing studies", ongoing monitoring is required after regulatory approval and is critical to informing the ongoing use of the therapy.3 Through such trials, researchers collect additional information about longer-term risks, benefits, and optimal use. These trials often involve thousands of participants and may continue for the lifetime of the drug.

 


 

Pfizer Clinical Trials in the UK

During 2017 within the UK, 60 Pfizer clinical trial protocols were in place, across 288 clinical trials sites that to date have enrolled over 4,000 patients.4

As part of our INSPIRE programme (Investigator Networks, Site Partnerships and Infrastructure for Research Excellence) we have built a trusted network of preferred locations for clinical trial research, which now spans over 90 sites around the globe, with 6 located in the UK.

 


 

Clinical Trial Data and Results

At Pfizer we believe researchers, trial participants, regulators, and others acting in the best interest of patients should have access to clinical trial data to advance medical understanding and promote data transparency.

That’s why we publicly share results from our clinical trials, whether the results are neutral, negative or positive. In line with regulatory requirements, we are committed to transparency, and so publish information about the purpose of each trial, the eligibility of patients to join the trial and the location of the study.

 

There are several ways in which we share trial results and data in the UK:

  • We submit clinical trial results for publication in peer reviewed journals within 18 months of primary completion date.
  • Every trial we run involving our compounds is registered and made public at ClinicalTrials.gov and where relevant the EU Clinical Trial Register. You can also view our clinical trial disclosure score on the EU Trials Tracker website.
  • We provide access to detailed clinical data in response to legitimate requests from researchers and regulators.
  • We participate in collaborative data-sharing initiatives such as Project Datasphere

 


 

Find a UK trial

The UK Clinical Trials Gateway (UKCTG) provides a comphrehensive list of clinical research studies running in the UK.

 


 

References

  1. ABPI, March 2012, 'Time to Flourish infographic'
  2. ABPI, May 2014, 'Innovation in Medicine Infographic'
  3. NHS UK June 2016, 'Clinical Trials'
  4. Pfizer data on file. July 2018
PP-PFE-GBR-1704 / April 2019