Lawrence LeBlond for redOrbit.com Your Universe Online

A blood test that can read genetic results much like a barcode has been developed by scientists at the Institute of Cancer Research (ICR) and the Royal Marsden NHS Foundation. This genetic blood test can also detect the most aggressive prostate cancers by reading particular patterns of gene activity.

Research staff believe the test could eventually be used to select patients who are most in need of immediate treatment. Prostate cancer is a very diverse disease. Some people live with it for years without any symptoms, but in others, the disease can be very aggressive and life-threatening, said lead author of the study, Professor Johann de Bono, of ICR, and an honorary consultant at Royal Marsden.

Current cancer screening tests include a biopsy, where doctors take a small sample of a tumor and examine it under a microscope to find out how dangerous it may be. Experts hope that the new barcode test will ultimately lead to more accurate estimations without invasive biopsy screenings. The researchers also believe the barcode test could be used in conjunction with current PSA screenings to select patients who are in dire need of treatment.

Described in The Lancet Oncology medical journal, the test is unique because it can assess changes in the pattern of gene activity in blood cells triggered by a tumor found elsewhere in the body.

Weve shown it is possible to learn more about prostate cancers by the signs they leave in the blood, allowing us to develop a test that is potentially more accurate than those available now and easier for patients than taking a biopsy. Our test reads the pattern of genetic activity like a barcode, picking up signs that a patient is likely to have a more aggressive cancer. Doctors should then be able to adjust the treatment they give accordingly, said de Bono.

In the trial, de Bono and colleagues scanned all the genes present in blood samples of 100 patients with prostate cancer at the Drug Development Unit in London and The Beatson West of Scotland Cancer Centre in Glasgow. The trial included 69 patients with advanced prostate cancer and 31 control patients with low-risk, early-stage cancer.

The team divided the patients into four groups reflecting their pattern of gene activitythe barcode. After reviewing all the patients progress over nearly 30 months, the researchers found patients in one group had survived for significantly less time than patients in others. Further modeling identified nine key active genes shared by all patients in the group.

The researchers then compared the results with another group of 70 US patients with advanced cancer. What they found is that these nine genes could be used to accurately identify those who survived for a shorter period9.2 months compared with 21.6 months for patients without the gene pattern. The findings suggest a number of the genes actually suppressed the immune system in patients whose cancers were spreading.

Whether particular genes are active or not is an important clue in identifying patients with a poor prognosis. This latest study shows that it is possible to read these patterns of gene activity like a barcode, allowing scientists to spot cancers that are likely to be more aggressive, said Professor Alan Ashworth, chief executive of The Institute of Cancer Research.

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‘Barcode’ Blood Test Reads Genetic Results, Helps Detect Aggressive Prostate Cancer

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