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About clinical trials

What is a clinical trial?

Clinical trials are an important part of clinical research and are at the heart of all medical advances. They are the primary way that researchers and doctors find out if new treatments are safe and effective and can provide hope and new opportunities for patients who may have exhausted current treatments and medications.

Clinical trials help us understand if a new treatment is more effective or not compared to current standard treatment options and what the potential side effects may be. They may also look at how to improve the quality of life for patients receiving cancer treatment, helping ease the physical pain that comes with a cancer diagnosis and providing relief and comfort to patients and their families.

How do clinical trials work?

A clinical trial is a scientific study which involves the organised testing and research of medicines and new treatment options for patients.

The results of a clinical trial can help prove if a certain medicine is safe and effective before introducing as a new treatment for a particular disease or condition.

Learn more about clinical trials

Each phase is considered a separate trial and, after completion of a phase, investigators are required to submit their data for approval before continuing on to the next phase.

In most cases it takes around 10 years for an experimental drug/treatment to move through all four phases.

Further information about how clinical trials work is available on the Australian Clinical Trial website.

Why do we need clinical trials?

Clinical trials are essential to the development, effectiveness and safety of new medical treatments, devices and diagnostic tests.

Medical treatments that are currently used are typically introduced following a clinical trial. Treatments for diseases and certain conditions, such as asthma or heart disease, are researched and developed through clinical research. Clinical trials often lead to new treatments that help people to live longer or with a better quality of life.

Clinical trials can help:

Detect or diagnose diseases or conditions
Treat diseases or conditions by testing a new medicine or other medical procedure
Determine if an existing drug can be used for other conditions or diseases

Types of clinical trials

Preclinical trials

Preclinical studies test an experimental drug or treatment before first-in-human testing begins using in vitro (test tube or cell culture) and in vivo (living organism) research, with the goal of identifying the starting dose should the treatment progress to a Phase I trial and assessing its safety and effectiveness.

Phase I clinical trials

Phase I of a trial tests an experimental drug or treatment on a small group of people, typically around 20-80, for the first time to measure the safety and side effects of the new drug and to get the correct dosage for the next phase.

Phase II clinical trials

A Phase II trial builds upon the positive results of a Phase I trial and tests this treatment in more people (50 -200) to assess effectiveness and get a deeper understanding of the best dosage level and any side effects.

Phase III clinical trials

Phase III trials test the treatment in a large number of people (100 – 2500) with the aim of proving effectiveness compared to the current treatment being provided.

Phase IV clinical trials

Phase IV trials monitor possible side effects once a new treatment has received regulatory approval over a much longer period of time in order to better define them and assess the long-term benefits and risks of treatment.

Phase I trial – Is the drug/treatment safe?

A Phase I trial is the first time a treatment has been tested outside of the research laboratory in a patient and lasts days to weeks.

These treatments are still experimental in nature but have shown positive results in the early research stage.
Phase I trials can offer hope and opportunity for our patients with advanced or rare cancers, or where traditional lines of treatment are no longer effective. They can also empower patients to contribute to the future of cancer treatment.

Phase II trial – Does the drug/treatment work?

This phase aims to gather data on if the drug or treatment is effective on those who have the certain disease or condition that is being treated.

These trials can last for months to years.
Phase II trials also continue to study the safety of the treatment, including short-term side effects

Phase III trial – Is the drug/treatment better than what is already available?

These trials gather more information about safety and effectiveness through studying different populations and different dosages, or using the experimental treatment in combination with other standard therapies. This data is integral for the treatment to be approved by the Government for future funding.

The experimental drug/treatment is administered to a large group of people to confirm its effectiveness compared with standard of care or equivalent treatments
These trials can last months to years
If the Australian TGA (Therapeutic Goods Administration) agrees that the Phase III trial results are positive, it may approve the experimental drug or treatment for use in the general public

Phase IV trial – What else do we need to know?

After a drug/treatment has been approved and made available to the public, researchers track its safety to seek more information about their risks, benefits and optimal use through a Phase IV clinical trial.

Researchers monitor the treatment’s safety through identifying any rare or long-term side effects and evaluating the real-world effectiveness in long-term situations

Helpful linksHelpful links

Please find a list of helpful resources below to help answer any questions you may have about research and clinical trials.

Become a patient

Find out how to become a patient at Icon Cancer Centre, or request more information from your nearest centre.

Express your interest

Talk to us about participating in a clinical trial.

Find a clinical trial

View Icon trials that are currently open for enrolment for cancer patients.

Participating in trials

Understand the process of participating in a clinical trial at Icon and what this may involve.