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Showing posts with label government. Show all posts
Showing posts with label government. Show all posts

Saturday, October 3, 2009

New Cancer Research Priorities Needed to Correct Imbalance that Leaves Important Questions Neglected

Cancer research is too focused on new drug development, while not enough money and effort is being devoted to pursuing important advances in knowledge likely to have the biggest impact on combating the disease in the next few decades, a leading research policy expert says, adding that a major shift in research priorities will be crucial to the ability to cope with the coming wave of cancer cases.

Professor Richard Sullivan of the King’s Health Partners Integrated Cancer Centre in London told Europe’s largest cancer congress, ECCO 15 – ESMO 34, the joint 15th European CanCer Organisation (ECCO) and 34th European Society for Medical Oncology (ESMO) Multidisciplinary Congress, September 20 – 24 in Berlin, Germany, that studies aiming to improve surgery, pathology and diagnostic and staging imaging, as well as a radical rethink of the approach to prevention research, must become the focus of public- and federally-funded cancer research now. The global public sector spend on cancer research was about €14 billion a year in 2004/05, the latest year for which figures are available. Non-commercial funders in Europe spent just over €3 billion on cancer research in 2004/05.

“An analysis we have just completed shows that, on average, European public funders are spending 74% of their money on fundamental biology and drug development research and that well over 70% of the cancer research initiatives at the European level are aimed at the same areas,” noted Prof Sullivan, who is also chairman of the European Cancer Research Managers Forum, which studies cancer research and funding in Europe.

“In the United States, the imbalance is even greater. There is no shortage of cancer drugs coming through pipeline and the whole area of drug research is quite healthy. What we need is a reapportioning of budgets from the charitable sector and public funders to carve out space for these other areas of cancer research that are largely invisible to a lot of policymakers."

“This is a deeply unfashionable view and the easy way out is to say that we must just ask for more money, but the reality is that we’ve got to prioritise,” Prof Sullivan said. “Most of the new medicines are having a small impact on the big picture of cancer burden at the moment, extending life by a few months. Research in this area is already heavily funded and that will continue regardless, as will the investments in fundamental cancer biology.”

The World Health Organization predicts that the number of people worldwide living with cancer will rise from about 28 million today to about 75 million in 2030. Detecting cancer early enough to treat it successfully and improving our understanding of how to make primary prevention strategies work hold the potential for the greatest gains, he said.

“This demands an overhaul of prevention research. You can take the quite reasonable view that we know the risk factors now. What we don’t understand is how to take that research on prevention and apply it in populations because we don’t understand the behaviour of those groups or how that might change over the next 20 or 30 years. For instance, how do we address the fact that many men across Europe will put up with rectal bleeding for a year before going to see a doctor? This is very important because cancer is not just about genes, it is predominantly about culture.”

"Cancer researchers must now be more imaginative and collaborate across unusual disciplinary boundaries to embrace behavioural engineering, population psychology, evolutionary biology, novel sociological methods and ideas such as cultural transmission theory – the study of how behaviours are learned and transmitted between generations," Sullivan explained

“Research in these novel areas addresses questions that can never be answered with classical epidemiological studies or standard social science questionnaires – we’ve reached the limits of enquiry with many standard approaches. There are people doing fantastic work that could be extremely useful not only to cancer research, but to medicine in general and most medics and researchers are completely ignorant about their existence and what they can do for medicine. It is a huge untapped area with massive potential to make a difference,” Prof Sullivan said.

The growing scale of cancer in developing countries also presents an imminent challenge for cancer research, he said. More than half of all cancer diagnoses occur in developing countries, which will bear a large majority of the global burden before long. Keeping the research focus as it is in developed countries will not address the problem in the developing and transitional countries because drug development is not going to be the answer. Surgery and radiotherapy are the most important approaches for reducing the global cancer burden and financial support for programmes that bring those treatments to developing countries is still very poor.

The argument is always made that there is enough to deal with in developing countries with the infectious disease challenges, but chronic disease is a major, often unrecognised problem and we can’t afford to wait any longer. Like it or not, developed countries have a responsibility to investigate which cancer control approaches are exportable and to support those institutions working in these areas,” he said.

Governments, research charities and European funders need to recognise the importance of shifting the focus to a new approach to prevention research and more investment in non-drug treatment research, but it will be largely up to cancer researchers to drive the change, Prof Sullivan said.

“There has already recently been a major shift in Europe toward hospital-university alliances driving the agenda. They need to start banging on the doors of the non-government organisations and the federal funders, lobbying hard and proving that it’s important to give attention to these neglected areas of cancer research.”

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Saturday, September 26, 2009

Combined Program of Vaccination and Testing for the Human Papilloma Virus Could Eradicate Cervical Cancer

Cervical neoplasia is usually an asymptomatic squamous cell carcinoma caused by human papilloma virus infection (HPV); less often, it is an adenocarcinoma. The recognition that human papilloma virus (HPV) is a cause of cervical cancer has opened new opportunities for the prevention of the disease. Primary prevention is now possible via immunization with highly efficacious HPV vaccines and secondary prevention has gained impetus with the advent of sensitive HPV DNA testing to improve traditional Pap cytology screening programs.

As a result, cervical cancer could be eradicated within the next 50 years. However, according to a cervical cancer screening expert, this can only happen if governments implement national screening programs based on detection of the human papilloma virus (HPV), which causes the disease, together with vaccination programs against the virus.

Professor Jack Cuzick told Europe’s largest cancer congress, ECCO 15 – ESMO 34, (the joint multidisciplinary 15th congress of the European CanCer Organisation and the 34th congress of the European Society for Medical Oncology), meeting in Berlin, Germany (September 20 – 24, 2009) that while the current HPV vaccines protect against two cancer-causing strains of the HPV virus, soon there would be vaccines available that protect against nine types. If vaccination were to be combined with HPV screening (which is much more sensitive than the currently used Pap smear test), then eventually the cancer would disappear in those countries that had successfully implemented national programs. However, this would require political will and effort at both national and European level.

“It’s important to say up front that the HPV is responsible for all cervix cancer,” Cuzick said. “If you can eradicate the virus, the cancer will not appear. So the current vaccine holds the promise of eradicating about 70-75% of cervical cancers (caused by HPV types 16 and 18), and there appears to be some additional cross protection amongst types that are closely related to 16 or 18, in particular 31, 45 and a little bit of 33. There are new vaccines being planned that will vaccinate against nine types. If they are successful, there should be no need to screen women that have been vaccinated at all. That’s the long-term future: vaccination and no screening. After about 50 years, we could see cervical cancer disappearing.”

As the current HPV vaccine only protects against two of the cancer-causing types, vaccinated women will still require screening for the rest of their lives.

“Women vaccinated above the age of about 16 will need to be regularly screened for the rest of their life, because the vaccine is not effective in women who have already been exposed to the virus. Even for girls vaccinated before this age with the current vaccine, there will be a need for some screening to protect from cancers caused by HPV types not in the vaccine, so screening is here to stay for the foreseeable future. However, we need to change to screening for HPV rather than the Pap smear test, and then it will be possible for the tests to be conducted at longer intervals,” said Prof Cuzick, who is the John Snow Professor of Epidemiology and head of department at the Cancer Research UK Centre for Epidemiology, Mathematics and Statistics, Wolfson Institute of Preventive Medicine (London, UK).

The Pap test uses cytology to detect pre-cancerous changes to cells; it relies on subjective assessments by people examining the cells in the smear with a microscope and so is open to human error. Prof Cuzick believes such errors will increase as the proportions of smears with affected cells decline due to increasing numbers of women having been vaccinated. In contrast, the HPV test is almost completely automated, is designed to detect the virus in the smear rather than relying on visual examination, and so is much less likely to be affected by human error.

Prof Cuzick said that countries should be switching to the HPV screening test now. “There’s overwhelming evidence that HPV screening is more effective than the Pap smear test, which misses about a third to a half of all high grade lesions. There are now several available commercial HPV tests and most of these tests show a sensitivity (the proportion of true positives correctly identified) in the order of 95% for high grade lesions, whereas cytology is somewhere between 50-70%. So it would really streamline the service because you could test less frequently, and it’s also been shown that the protection lasts longer so that screening every five to seven years is probably appropriate.”

However, he warned that the European Union and national governments should take the initiative in discussions on implementing screening and vaccination programs, rather than leaving it to pharmaceutical companies to lead the debate.

“The European Commission and Parliament, together with national governments, could be doing more to promote HPV testing. One of the most useful things the EU could do would be to provide a forum for the dissemination of knowledge about the role of HPV both to doctors and to the general public. It could sponsor a major symposium to discuss HPV testing, vaccination and the best strategies for implementing programs in member countries."

“There’s been a lot of concern, particularly with the vaccine, that dissemination of information about HPV has come mainly from the drug companies, and people are, not surprisingly, a little sceptical of pharmaceutical-based education programs. So if the EU was to take this up without pharmaceutical support, I think it would be very appropriate and it would provide a forum that would be extremely legitimate.”

Although current HPV tests are more expensive than cytology tests, Prof Cuzick said the price would go down as the volume of tests increased. In addition, the fact that it’s more accurate and women could be screened at longer intervals meant that switching to HPV testing could save governments money in the long term.

“For younger women we think HPV testing should happen every five years starting at age 25-30; by the time they’re 50, if they’ve been negative, they could probably be screened every eight years. So there’s a lot to be gained, both in terms of better protection and less frequent screening, which will save time and money. If women can go less often and get more protection it makes a lot of sense.”

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Images courtesy American Society of Clinical oncology (ASCO).