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Miracle cures: expensive pills of the future

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http://www.int.iol.co.za/index.php?set_ ... 947C795563

April 09 2006 at 05:00PM

We are on the edge of a new era of drug discovery and decades of research into the basic science of biological systems is starting to bear fruit. Within the next 10 years new drugs tailored to individuals that will be both safer and more effective are set to appear on the market.

New additions to the bathroom cabinet will include powerful statins to cut cholesterol, enzymes to promote digestive health and new classes of painkillers geared to personal pain receptors.

Patients will have access to stem cells from which new tissue can be grown, and DNA profiling setting out their risks of developing or passing on inherited disease, and tests for predicting individual drug response.

Gene therapy for certain childhood blood conditions such as severe combined immunodeficiency disorder has already proved effective, heralding a revolution in treatments for inherited disease.

'Designer cancer drugs'

In fertility treatment, scientists are working on making sperm and eggs from skin cells in a process known as haploidisation. If successful, it could bring hope to the one in six infertile couples who are unable to produce their own genetic offspring.

The new drug for breast cancer, Herceptin, is a harbinger of drug developments to come. It is one of a new class of cancer drugs that some experts claim will transform cancer from a killer disease to a chronic condition like diabetes.

Herceptin is among the first of the new "personalised" medicines - only effective in the 20 percent of breast cancer patients with a specific genetic profile, marked by the presence of Her2-positive receptors.

This new class of "designer" cancer drugs, built from research on cancer at the molecular level and designed to have a specific action, will mean better targeted treatments suitable for specific groups of patients.

"The molecular era is starting, in which we will be able to break down diseases into more specific entities. It has started in cancer in a dramatic way," Sir David Weatherall, the Regius Professor of Medicine at Oxford University, said recently.

'Molecular era is starting'

But there is a downside to this new era of personalised treatment. The drugs will be much more expensive because they are suitable for fewer people. One reason for the high cost of Herceptin - around �20 000 (about R210 000) a year - is that the potential market is only one-fifth of that for other breast cancer drugs.

The new drug for lung cancer, Tarceva, is being hailed as a breakthrough in the treatment of the disease but it costs �75 a day and must be taken for life.

Progress will not only come from drug development. Surgeons will soon attempt the ultimate cosmetic operation - a whole face transplant.

New surgical techniques combined with developments in anaesthetics will mean more treatment can be delivered outside hospitals in clinics and GPs' surgeries. Last month the first woman to have a kidney removed through keyhole surgery was able to leave hospital and return home the same day.

One of the most urgent areas of research is in vaccines against avian flu. The H5N1 virus that has decimated poultry flocks in the Far East, infected 176 people and killed 97, is slowly evolving. The risk of a flu pandemic is higher than it has been for 30 years.

Scientists are racing against time to develop an effective vaccine. The lives of millions of people may depend on it.

Pfizer - CP-690,550 treats rheumatoid arthritis:

Rheumatoid arthritis occurs when the immune system is overactive or faulty, leading to inflammation, swelling and pain in healthy tissue. CP-690,550 blocks an enzyme known as Jak3 found only in immune system cells. Blocking Jak3 suppresses the immune system and thus relieves the arthritis, while not affecting other systems of the body. Current drugs target enzymes found in cells throughout the body, resulting in toxic sideeffects. CP-690,550 could also treat a number of other auto-immune diseases such as eczema and psoriasis, and help transplant patients.

Somaxon - Nalmefene treats 000 addiction:

Behaviour and mental health is one of the biggest growth areas, with more than 2 000 clinical trials recruiting, to test drugs tackling conditions ranging from agoraphobia and 000, to stress and transsexualism. Nalmefene has been on trial as a way of taking the thrill out of 000 - six out of 10 pathological gamblers who took the pill daily benefited. An opiate antagonist, it blocks the part of the brain that processes pleasure. It is being tested next for compulsive shopping and may work for kleptomania and pyromania.

�lan Pharmaceuticals - AAB-001 treats Alzheimer's:

Alzheimer's is a leading target of research, with more than 100 trials recruiting. AAB-001 aims to provide antibodies to beta amyloid, the protein involved in the disease's development. Animal studies have shown this approach is effective in clearing beta amyloid from the brain. Around 30 hospitals are likely to be involved in a clinical trial. Another drug on trial, FK962, triggers the release of the hormone somatostatin in parts of the brain involved in learning and memory. Alzheimer's is associated with reduced brain levels of several neurotransmitters, including somatostatin.

Vanda - VEC-162 treats sleep disorders:

There are more than 40 clinical trials of drugs and treatments for sleep disorders under way. Vanda's VEC-162, now in clinical trials, is a new type of drug known as a melatonin agonist, developed for the treatment of sleep problems and mood disorders.

Melatonin is secreted by the pineal gland, a pea-size structure at the centre of the brain, at night, and it helps to regulate the sleep-wake cycles. Melatonin supplements are used for jet lag and increasingly for sleep conditions, but the new drug would get the body to adjust its own production levels of the compound. Research suggest that drugs like VEC-162 induce more natural sleep than traditional sleeping pills.

Othera Pharmaceuticals - OT-551 treats blindness:

Age-related macular degeneration is the leading cause of blindness in the over-60s and affects one in four of this group in Britain. The rods and cones in the central part of the retina stop working, making it difficult or impossible to see fine detail. No exact cause is known, but the build-up of oxidative damage is thought to be a major factor. OT-551 is the first of a new type of drug called catalytic anti-oxidants that are designed to boost the body's natural defences against free-radical damage. A small dose taken as an eye drop could be effective for long periods.

National Centre for Complimentary and Alternative Medicine - mistletoe treats lung cancer:

More than 240 drugs for lung cancer are at various stages of research and development. A new drug is desperately needed - five-year survival rates are among the lowest of all the malignancies. But not all the new avenues feature man-made drugs. Mistletoe extract, which has a number of uses in traditional folk medicine, is being investigated in a small clinical trial as a potential treatment for advanced solid tumours. Early research suggests mistletoe stimulates the immune system into attacking cancer cells.

Merck - Isis-113715 treats obesity:

Around one in five adults in Britain are obese and hundreds of potential drugs are at varying stages of development. According to McGill University in Montreal, at least 20 companies are focusing on an enzyme called PTP1B, which prevents a fat-burning hormone, leptin, working properly. Early research on animals shows that those who had low levels of PTP1B were lean with little or no fat. "If leptin does not work, you will become obese," says Dr Philip Scarpace of the University of Florida.

GlaxoSmithKline - GW274150 treats migraine:

Prevention as well as the easing of symptoms are the aims of new drugs. GW274150 aims to control nitric oxide, which is thought to play a part in the development of migraine headache. It works by reducing levels of nitric oxide synthase, a chemical involved in the production of the oxide. GW274150 is on trial as a potential prophylactic treatment for migraine. Another drug, SB-705498, is designed to work on receptors in the trigeminal nerve, one of the cranial nerves on each side of the head.

The aim is to block the receptor to get rid of the pain and lower sensitivity. - Foreign Service

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