A revolutionary approach to treating cancer using DNA tests can shrink tumors at six times the rates of conventional medicine. Experts said the promise shown by “precision medicine” was “the most exciting thing since chemotherapy” meaning that in future, patients could be saved by £200 gene tests. It could mean around one in three women who currently undergo grueling rounds of chemotherapy could be spared it, because of clues in their genetic profile.
Clinical trials involving more than 13,000 patients found that those given treatments using the targeted methods, saw disease stalled and tumors shrink at rates far beyond those of standard treatment. The approach means patients are given treatment based on targeted gene sequencing or using their whole genetic profile. Personalized medicine is a very, very different way of treating patients. It’s the most exciting thing since chemotherapy. The information allows oncologists to select and modify treatment – with estimates that it could mean 7,000 breast cancer sufferers could be spared grueling chemotherapy every year. Experts said treatment on the basis of DNA tests could become the norm within five years.
Until now, scientists have been hopeful of the advantages from treatments based on genetic profiling, which is increasingly used on a trial basis, but there has been no major study examining them in depth.
Cancer medicine has become increasingly personalized, with tests for particular genes, such as the BRCA1 gene, carried by actress Angelina Jolie
Researchers found that tumors in patients who received targeted treatments had shrinkage rates of 30.6 percent, compared with 4.9 percent in those who did not.
Patients given treatment based on specific biomarkers also had a longer time before the disease worsened, with median progression-free survival of 5.7 months compared with 2.95 months for those who were treated with a “blanket” approach.
Rowena Sharpe, head of precision medicine at Cancer Research UK said: “Personalized medicine is a very, very different way of treating patients. It’s the most exciting thing since chemotherapy.”
She said the approach meant that patients could be given the right treatment first, instead of a system of trial and error which means many undergo toxic therapies they may never have needed, instead of the combination they needed.
Prof Roy Herbst, chief of medical oncology at Yale Cancer Centre, said: “This is about finding the right key for the lock. Finding out what it is that is driving the tumor, what makes it tick. “I believe the potential is huge,” said Prof Herbst, who said large scale international trials were needed, to ensure the most detailed genetic profiles could be built.
The leading oncologist said that within five years, patients could be offered “upfront” genetic profiling, so that tailored treatment could be offered without even the delay of tests.
British researchers are about to launch a new trial personalized breast cancer medicine which could see 7,000 women a year spared chemotherapy, while saving the NHS £17m annually.
The study by University College London, Cambridge University and Cancer Research UK will mean all women will undergo a genetic test of tumor as soon as diagnosed, with results due in 2020. Such tests currently cost around £2,000 – around half the cost of a £4,000 course of chemotherapy.
Baroness Delyth Morgan, chief executive at Breast Cancer Now, said: “This comprehensive study shows that by using biomarkers to match up a tumor’s key features with the most suitable treatments, patients can see real benefit from new drugs at an earlier stage.
“Personalized medicine represents the future of cancer treatment. Everyone’s breast cancer is different, and the better we can target drugs to the exact make-up of a patient’s tumor, the more effective we will be in stopping this dreadful disease.”