The Atlanta Journal-Constitution
Blood test can detect early signs of 8 cancers
Researchers to start treatment before symptoms worsen.
Scientists are reporting progress on a blood test to detect many types of cancer at an early stage, including some of the most deadly ones that lack screening tools now.
Many groups are working on liquid biopsy tests, which look for DNA and other things that tumors shed into blood, to try to fifind cancer before it spreads, when chances of cure are best.
In a study Thursday in the journal Science, Johns Hopkins University scientists looked to see howwell their experimental test detected cancer in people already
known to have the disease. The blood tests found about 70 percent of eight common types of cancer in the 1,005 patients. The rates varied depending on the type — lower for breast tumors but
high for ovarian, liver and pancreatic ones.
In many cases, the test narrowed the possible origin of the cancer to one or two places, such as colon or lung, important for limiting howmuch follow-up testing a patient might need. It gave only seven false alarms when tried on 812 others without cancer.
The test is nowhere near ready for use yet; it needs to be validated in a larger study already underway in a general population, rather than cancer patients, to see if it truly works and helps save lives — the best measure of a screening test’s value.
“We’re very, very excited and see this as a fifirst step,” said Nickolas Papadopoulos, one of the Hopkins study leaders. “Butwe don’t want people calling up” and asking for the test now, because it’s not available, he said.
Some independent experts saw great promise.
“It’s such a good fifirst set of results” that it gives hope this approach will pan out, said Dr. Peter Bach, a health policy expert at Memorial Sloan Kettering Cancer Center who consults for a gene testing company. “Anything close to 50 percent or 40 percent detection is pretty exciting stuffffffffffff,” and this one did better than that, he said.
Dr. Len Lichtenfeld, deputy chief medical offifficer of the American Cancer Society, was encouraged that the test did well on cancers that lack screening tests now. If a blood test could fifind 98 percent of ovarian cancers at an early stage, as these early results suggest, “that would be a signifificant advance,” he said.
But he cautioned: “We have a long way to go to demonstrate its effectiveness as a screening test.”
Testing the test
The test detects mutations in 16 genes tied to cancer and measures eight proteins that often are elevated when cancer is present. It covers breast, colon and lung and five kinds that don’t have screening tests for people at average risk: ovarian, liver, stomach, pancreatic and esophageal. Prostate cancer is not included. A blood test already is widely used — the PSA test — but its value for screening is controversial.
Researchers tried the new test on people whose cancers were still confifined to where it started or had spread a little but not widely throughout the body. It detected 33 percent of breast cancers,
about 60percent of colon or lung cancers and nearly all of the ovarian and liver ones. It did better when tumors were larger or had spread. It did less well at the very earliest stage.
Caveats and next steps
The test probably will not work as well when tested in a general population rather
than those already known to have cancer, researchers say. Hopkins and Geisinger Health Systemin Pennsylvania have started a study of it in 10,000 Geisinger patients who will be tracked for at least fifive years.
The work was financed by many foundations, the Mayo Clinic, the National Institutes of Health and Howard Hughes Medical
Institute, which provides The Associated Press with funding for health and science coverage. Many study leaders have fifinancial ties to gene testing companies, and some get royalties for patents on cancer detection methods. Researchers say the test could cost around $500 based on current materials and methods, but the ultimate goal is to commercialize it, so what a company would charge is unknown.
Other liquid biopsy news
Also this week, Taiwan- based Cell Max Life gave results on its liquid biopsy test, which looks for whole tumor cells shed into blood, at an American Society of
Clinical Oncology conference. Researchers tested 620 people getting colonoscopies or with confirmed colon cancer at a hospital in Taiwan. The company said its test had an overall accuracy of 84 to 88 percent for
detecting cancer or precancerous growths and a false
alarm rate around 3 percent. The company’s chief executive, Atul Sharan, said U.S. studies should start this year. The test is sold nowin Taiwan for $ 500, but should cost around $150 in the U.S., he said. Dr. Richard Schilsky, chief medical offifficer of the oncology society, said results are encouraging, but the test needs more study, especially to see if it gives too many false alarms. “The last
thing you’d want is a test that tells youmight have cancer if you don’t,” he said.