Study shows huge asymmetry in cancer clinical trials in different countries

Reviewed by Emily Henderson, B.Sc.Sep 18 2020

Access to cancer medicines is highly unequal across Europe both for new drugs in development because of uneven access to clinical trials and for currently approved drugs due to huge disparities in healthcare spending by different countries, according to results from studies presented at ESMO 2020.

Countries in Western Europe run a higher number of clinical trials for novel cancer treatments than countries in Eastern and Central Europe, showed an analysis of clinical trials active in different countries that indicated large differences in access to new treatments in development for cancer patients depending on where they live.

"Our study gives us proof of what we previously suspected, that there is a huge asymmetry in the number of clinical trials for cancer treatments in different countries," said study co-author Dr Teresa Amaral, from University Hospital Tubingen, Germany.

"Having access to clinical trials confers several benefits to cancer patients. It means they can potentially access novel therapies earlier during the trial phase rather than having to wait for licensing and reimbursement," she explained. "Also, all trial participants benefit from the regular follow-up and monitoring involved in taking part in a clinical study."

The researchers searched the Clinicaltrials.gov database for interventional clinical trials in adults with tumours between 2009 and 2019. Analysing the number of trials in 34 European countries revealed huge differences. Albania had the lowest number of active clinical trials for cancer (0.14 clinical trials per 100 000 population) while Belgium had the highest number (11.06 per 100 000).

Further results showed that the total number of oncology clinical trials performed in European countries increased by 33% between 2010 and 2018, with a much greater increase in early phase trials (61% increase in phase I-II trials) than late-phase trials (7% increase in phase 2-3 trials).

Amaral suggested that this might be due to a shift in clinical trial design: "There is no longer a clear progression from first-in-human studies to phase1, phase 2 and then much larger phase 3 trials. Instead we tend to have more trials in earlier phases, namely phase II, which might expand to later phases."

The increase in early phase trials was again a symmetrical and the growth rate depended on the baseline number of trials. "Countries need to have the necessary infrastructure and expertise to conduct trials of any type, including early phase trials."

A higher number of phase I trials is a sign of more active research going on in a particular country, with the appropriate infrastructure and necessary incentives to conduct clinical trials. And the only way to develop new cancer drugs is to be able to put patients into clinical trials."

Thomas Cerny, Professor of Medical Oncology, University of Berne, Switzerland and Member of the ESMO Principles of Clinical Trials and Systemic Therapy Faculty

"The difference in the number of clinical trials per head of population, with more trials in wealthier countries, means access to clinical trials and innovative drugs is just not possible for cancer patients living in many less wealthy countries." Although the study is descriptive, he considered it made best use of the available data to evaluate differences in clinical trial availability in different countries.

He added: "Clinical studies require a solid infrastructure in terms of personnel and equipment, and this depends on a country's overall financial situation. These requirements are increasing so the gap in clinical trial capacity is not likely to reduce soon."

"There is still a lot to do to increase access to clinical trials for cancer patients in different countries," agreed Amaral.

"The voluntary harmonisation procedure, in which trial sponsors can submit trial documentation to several countries at the same time, has streamlined the process and reduced the approval time for trials. But more is needed to increase access to clinical trials in countries where the number of trials is currently low." The research group is currently exploring the reasons for the asymmetry to inform potential solutions.

A health economics analysis also reported at ESMO 2020 showed that wealthier European countries spent ten times as much as poorer countries per inhabitant on cancer medicines in 2018, following a similar pattern to that seen for clinical trials. (2)

"There was a huge difference in spending on cancer medicines," said lead author Dr Nils Wilking, from the Karolinska Instituet, Stockholm, Sweden. "We found that inequalities are mainly related to countries' economic strength and not to the disease burden of cancer."

The researchers estimated cancer-specific health expenditure for 31 countries (EU-27 plus Iceland, Norway, Switzerland and the UK) using national figures for 2018. Results showed the top spenders on cancer medicines were Austria, Germany and Switzerland (Euros 90 to 108 per capita) while the lowest spenders were the Czech Republic, Latvia and Poland (Euros 13 to 16). The largest differences in spending between countries were seen for immuno-oncology drugs.

"There are two main factors accounting for the differences in spending on cancer medicines: one is shortage of money and the other is drugs not being approved for use by some healthcare systems," suggested Wilking. He noted that, although the study did not consider data at the individual patient level, the difference observed in access to cancer medicines would affect patient outcomes.

Cerny commented: "It is difficult to assess the real costs in any country because systems vary in different countries and there are many hidden costs not reflected in the databases used. But the study essentially shows the more a country has to spend, the more its inhabitants have access to cancer medicines."

Considering how to widen access to cancer medicines, Wilking suggested: "We need a model in which we incentivise innovation of valuable medicines through outcome-based payment models and consider a disease area and what a society is able to pay for treatment."

He added: "The work of health technology assessment organisations has been important and a critical scrutiny and evaluation of new drugs should always be applied."