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To: Icebrg who wrote (2753)11/5/2003 12:54:28 PM
From: Jim Oravetz  Respond to of 7143
 
Tiny Protein May Lead To Better Screen Test For Prostate Cancer
By LAURA JOHANNES
Staff Reporter of THE WALL STREET JOURNAL

A cutting-edge research technique called proteomics is emerging as medical science's best hope for an alternative to the wildly inaccurate standard screen for prostate cancer.

In the latest successful use of the technology -- which involves an exhaustive study of the proteins in human blood and tissues -- Harvard University researchers have discovered a tiny protein called PCa-24, which is found in tissues taken from men with prostate cancer, but not in similar samples from healthy men. The finding was reported in Monday's online version of the journal Cancer.

It is too early to tell, but scientists are hoping the protein is created by prostate-cancer cells, thus serving as a telltale sign of their presence. That, says researcher Brian Liu, an assistant professor at Harvard Medical School and at Brigham and Women's Hospital, "would be exactly what we want."

If the Harvard protein proves as promising as it seems, a blood test could be commercially available within four years. Two companies -- closely held Correlogic Systems Inc. of Bethesda, Md., and Matritech Inc., of Newton, Mass. -- are racing to parlay proteomics discoveries from academic and government labs into commercially available prostate screens to hit the market next year.

"We believe our marker is better and we plan to position it at a premium price," says Matritech Chief Executive Stephen D. Chubb.

The standard blood test, which gained popularity in the 1980s, costs around $30 to $40. It measures levels of a protein called the Prostate Specific Antigen. However, PSA is often elevated in men without cancer. It also misses cancers: In a recent New England Journal of Medicine report, the PSA screen failed to spot 82% of cancers in men over 60.

FLAWED SCREENING

Some facts about prostate cancer and the PSA test:

• In 2000, 31,078 men in the U.S. died from prostate cancer.

• False positives occur primarily in men age 50 or older. In this age group, 15 of every 100 men will have elevated PSA levels. Of these, 12 will be false positives and three will turn out to have cancer.

• False negatives occur in roughly 25% to 30% of PSA tests.

Sources: National Cancer Institute, NCHS

The impact of proteomics is "very exciting and very important," says Howard Parnes, chief of the prostate and urologic research group at the National Cancer Institute. But, he adds, more accurate tests for cancer won't solve a fundamental problem in prostate-cancer treatment -- what he calls the "inherent harm of overdiagnosis."

Sixteen percent of men develop prostate cancer in their lifetimes, but it is usually slow-growing, and only 3% die of it. The new test is "a two-edged sword," Dr. Parnes says. "The more prostate cancer you find, the more that will be treated." Surgery to remove the prostate causes incontinence about 30% of the time and impotence in 70%.

While the next-generation tests' improved detection wouldn't solve the problem of which cancers require treatment, it would cut down on unnecessary biopsies -- unpleasant procedures in which needle gun is used to take a sample of prostate tissue.

The main tool for proteomics research is a machine called a "mass spectrometer." It costs about $200,000, "as much as a house," says Harvard's Dr. Liu. Mass spectrometers have been around for years, but better software has dramatically improved their utility for proteomics, he says.

The Harvard team started with prostate tissues from 17 men with cancer, and 12 who merely had enlarged prostates. An enlarged prostate is a common, often-noncancerous condition that often causes a positive result on the PSA test.

The team isolated cells from the various tissues, ground them up and put them on a slide. They put the slide into the machine, which fired a laser beam at it. The laser heated the proteins on the slide so intensely that the proteins vaporized and triggered a detector that registers their vaporization. The smaller proteins vaporized the fastest, so the machine gave scientists a precise readout of which size proteins were present in each tissue sample. The easiest way to identify a protein is by its size.

The result: A tiny protein, PCa-24, did not exist in any of the noncancerous tissues. But it was present in 16 of the 17 cancerous tissues, or 94%. The scientists have just begun blood tests of live human patients -- so far about 10 or 15 -- and so far PCa-24 seems to predict cancer with stunning accuracy. Scientists know little about the protein except its size; further work is under way to purify it and study it.

At the Clinical Proteomics Program, a joint effort of the National Cancer Institute and the Food and Drug Administration, instead of looking for single proteins that could indicate the presence of cancer, researchers are examining all the proteins in the body, and training a powerful computer to find subtle patterns that indicate cancer, says program co-director Emanuel F. Petricoin.

"It's basically like a bar code, like your Cap'n Crunch cereal at the grocery store, except with a million lines," Dr. Petricoin says. "Somewhere buried in this pattern there would be a diagnostic combination of not just one or two or three biomarkers, but a whole handful." Dr. Petricoin believes this method is most promising because there may not be a single smoking gun in many men with cancer.

Correlogic, in partnership with Dr. Petricoin's team, is developing an ovarian-cancer test that is expected to hit the market late this year or early next year, says Chief Executive Peter Levine. A similar prostate screen could be available later next year. The focus will be the "gray zone" where the PSA reading is too high to be normal, but too low to provide a firm indicator of cancer. Both tests, says Mr. Levine, will initially be sold as "home-brew" lab screens that don't require FDA approval.

Matritech, meanwhile, has entered into a deal with mass-spectrometer maker Bruker Biosciences Corp., of Billerica, Mass., to create a method for screening thousands of blood samples quickly and accurately -- as many as 1,000 in an eight-hour shift. The test would look for a protein, called Nuclear Matrix Protein 48, which Johns Hopkins research has found to be present in cancerous prostates but not in healthy ones.

In the long run, proteomics may help create a test that distinguishes fast-growing cancers from indolent ones. Dr. Petricoin's lab, along with Ohio State University physicist Mauro Ferrari, is developing a Star Trek-like technology in which "nanoparticles" would be crafted that would bind to telltale proteins in the blood. The probes would then be collected, perhaps by using a magnet on the patient. This technique would allow scientists to find proteins present in such small amounts that the mass spectrometer would miss them. Some of these proteins might serve as a warning that a cancer will spread quickly. "We've just started the odyssey," says Dr. Petricoin. "I really think it is going to be quite astonishing what we can do."



To: Icebrg who wrote (2753)1/2/2004 3:33:14 AM
From: Icebrg  Read Replies (1) | Respond to of 7143
 
Venture Capital: Airplanes ... to antibodies

As the pressure to diversify increases in the Seattle area, some wonder whether the region is counting too much on the future of businesses summed up by a three-syllable buzzwordPower brokers lead the charge for newest economic hope

By JOHN COOK
SEATTLE POST-INTELLIGENCER REPORTER

Does the Puget Sound region have what it takes to become a world class biotechnology hub?

That question will be on the minds of plenty of folks this year -- from politicians and urban planners to real estate developers and venture capitalists.

A lot is at stake as the Seattle area attempts to make the transformation from airplanes to antibodies. And 2004 could be the pivotal year in which the momentum behind Seattle's growing biotechnology industry coalesces.

While supporters believe biotech is the best long-term economic hope for the region, detractors wonder if the prospects are overstated.

The biotech charge is being led by some of the region's biggest power brokers.

# Seattle Mayor Greg Nickels is rolling the dice with his political future by supporting efforts to redevelop the South Lake Union biotechnology corridor.

# Microsoft co-founder Paul Allen is dedicating a chunk of his multibillion dollar fortune to biotech research, real estate and investments.

# And cities such as Renton are courting life science companies as a way to replace dwindling aerospace jobs.

Like the biotechnology industry itself, it will take years -- maybe decades -- to determine if the bets pay off.

But many agree that the state can't afford to let the opportunity pass by. There are signs that Seattle's biotechnology industry -- among the top 10 in the country in terms of jobs, companies and venture funding -- is starting to fire on all cylinders.

Next week, the Technology Alliance plans to deliver a proposal to Gov. Gary Locke that calls for increased government funds for biotechnology projects in the state. Dubbed Bio 21, the proposal is designed to make the state more competitive in attracting and growing biotechnology companies.

Later this month, Amgen will open a state-of-the-art research facility along Elliott Bay -- an important ribbon cutting by the company that acquired Immunex.

Two Seattle area biotechnology companies -- Icos and Corixa -- will ramp up marketing efforts for their recently approved drugs. And Seattle cancer research company Xcyte Therapies is expected to go public in the coming months.

"It is really a defining time and an exciting time," said Ruth Scott, president of the Washington Biotechnology and Biomedical Association, a trade group that represents the state's 190 life science companies and research organizations.

But with states such as Michigan, New York and North Carolina looking to grow their own stable of biotechnology companies, Scott does not believe there is time to rest. "I think we have some challenges ahead of us," she said. "I hope we as a state don't turn our back on this industry."

That's also the hope of Susannah Malarkey, who worked with a 25-person steering committee to develop the Bio 21 proposal. She declined to say how much money the committee was recommending for biotech research in the state, leaving the final decision up to Locke. But she acknowledged the importance of the proposal.

"This really allows Washington to put a stake in the ground in a way that it never has before," said Malarkey, executive director of the Technology Alliance. "Washington has enormous assets, but we are obviously not alone in pursuing these opportunities and as a state we have to play catch up because we are 46th out 50 states in terms of state investment in research capacity."

Robert Nelsen, a venture capitalist with Arch Venture Partners, is encouraged with initiatives like Bio 21 and he believes the region has a "good shot" at becoming a hotbed for biotechnology research. After years of debate, he thinks political leaders have started to embrace the role that biotechnology can play in the economy. Ironically, he said, Boeing's 7E7 campaign served as a wake-up call.

"People realized that Boeing is not the savior and they started looking forward," said Nelsen. "People outside the industry started asking, 'Where are we going to be in 20 years?' It is going to be software and biotech, not aerospace."

Momentum is building around that idea -- driven in part by two of the world's richest men who happen to live on shores of Lake Washington. Microsoft co-founders Bill Gates and Paul Allen have taken a keen interest in Seattle's biotechnology community: bankrolling start-ups, recruiting world-renowned scientists and donating millions of dollars to research institutions. Allen, a cancer survivor, primarily works through his investment arm of Vulcan Inc. Gates, whose mother died of cancer in 1994, has the Bill & Melinda Gates Foundation.

It is almost hard to imagine what the Seattle biotechnology community would look like today without their contributions.

Last April, Bill Gates donated $70 million to the University of Washington to create a research facility for genomic science. A few months later, Allen established the non-profit Allen Institute for Brain Science with a $100 million gift.

Those contributions are on top of the estimated $400 million that Allen is pumping into the South Lake Union neighborhood and the billions of dollars that Gates is donating to world health issues.

Together, Allen and Gates have helped jump-start many of the region's biotechnology companies: Corixa, Icos, Seattle Genetics, Dendreon and Regulome.

And their interest in the sector does not appear to be waning.

Even though Seattle's biotechnology industry is benefiting from rich benefactors and strong research institutions, some skeptics question whether it can really add much fuel to the economy.

"We are just dropping off the cliff because they think what is good for Paul Allen is good for the rest of us," said John Fox, the coordinator of the Seattle Displacement Coalition, who last month criticized development plans in the South Lake Union neighborhood. "There are some highly speculative assumptions about whether or not we can compete with the 200 other cities that are competing for biotech in the country."

Portland economist Joseph Cortright, who co-wrote a study on U.S. biotechnology regions for The Brookings Institution in 2002, said the competition is intense for biotechnology companies.

"Ten years ago everybody wanted to be the next Silicon Valley. Three or four years ago everybody wanted to be the next center of e-commerce and dot-coms. And this year the flavor of the month for the economic development fraternity is biotechnology and everybody is going after it," said Cortright. "And there are a couple of problems with that."

For one, biotechnology companies do not employ many people.

Of the nine major biotechnology centers in the United States, not one has a life science company among the top 25 employers. Nationally, only 44 biotech companies employ more than 1,000 people.

"This is an industry that is still really quite small," said Cortright. "So there aren't any Boeings out there and there aren't any Microsofts out there." An estimated 6,200 people work in the Puget Sound region's life science industry, according to Cortright's research. That's far fewer than the 27,200 people employed by Microsoft here.

The Washington Biotechnology and Biomedical Association uses different figures, estimating that there are 19,500 people working in the state's biotechnology and biomedical industry.

Whatever figures are used, Cortright said, it is unlikely that a biotechnology company will become the largest employer in any one region.

In addition to the limited employment opportunities, Cortright said, it can take years for biotechnology companies to develop new drugs.

It took 10 years for Bothell-based Icos to bring the erectile dysfunction drug Cialis to market. But for every Cialis, there are a number of drugs that never make it out of clinical trials.

Because it takes so long to develop new drugs and because so many fail, Cortright said, it could take several decades for a new biotechnology hub to emerge. That's bad news for community leaders who think biotech can quickly replace dying industries.

"Anyone who is assuming that they are going to do real estate development this year and see a bunch of biotech companies in the next decade, they are dreaming," Cortright said.

Still, some communities are giving it a try. The city of Renton is preparing for the day when Boeing no longer makes airplanes at the massive hangars on the sound end of Lake Washington.

In November, the Renton City Council authorized rezoning of the Boeing plant for biotechnology and other uses. Alex Pietsch, who heads Renton's department of economic development, said Boeing could vacate as much as 75 acres in the city in the next two or three years. While it is unlikely that biotechnology companies would consume all of that land, Pietsch said, he could imagine some spillover from Seattle.

"Obviously South Lake Union is going to happen," said Pietsch. "But if biotechnology lives up to its potential in the region, then there are going to be life sciences companies that either need more space than is available in South Lake Union or that is at a different price point."

Nelsen, the venture capitalist whose early-stage investments include Accelerator, Ceptyr and Trubion Pharmaceuticals, worries that too much pressure will be placed on the back of the Seattle biotechnology industry. "The biggest danger is that people's expectations get so high that they think it is going to solve all problems and that is not going to happen. But it is clearly the most exciting industry in the state."

Managing expectations also will be an important task for the trade group's Scott.

"The challenge really for our organization is to try to direct all of this interest and enthusiasm into the right areas because everybody is so high on biotech, yet they don't understand the complexities," she said. "So we really have to focus."

Cortright thinks that is a smart move. But he also warns cities about placing too much faith on biotech.

"I am not at all optimistic that the biotech industry will be this powerhouse of growth in the U.S. and even in the metropolitan areas," he said.

"I think it is going to be a small component of your metropolitan economy."

seattlepi.nwsource.com