Chemotherapy is often used after surgery to reduce the chance of breast cancer spreading or coming back. The test, which has been on the market for several years, analyzes the activity of 21 genes to predict a woman's risk of recurrence over 10 years.
The findings apply to about 60,000 women a year in the United States, according to Dr Joseph A Sparano of Montefiore Medical Center in NY, the leader of the study.
"It also helps identify those women with this disease who really do benefit from the chemotherapy", he said. They are going to change treatment and remove uncertainty for women making decisions, ' Allison Kurian, an oncologist at Stanford University who was not involved in the trial said.
Many oncologists are expected to follow the study's findings and allow women with stage I or stage II HER2-negative breast cancer to avoid the toxicity and side effects of chemotherapy. "It was all gone", she said. "In the current study, we found that the tumors of African-American women attract regulatory T-cells that calm down our killer lymphocytes and inhibit the body's ability to defend against cancer". Hormone therapy alone was as good as a combination of chemotherapy and hormone therapy in women with an intermediate risk of their cancer returning. Generally, after surgery, such patients receive endocrine therapy, such as tamoxifen, which is created to block the cancer-spurring effects of hormones.
What will she tell women who under prior guidelines received chemo and all its side effects and didn't need it after all?
Looking ahead, Sparano hopes to see if this research could be applied to patients whose cancer has already spread to the lymph nodes, which is prognostic for a higher rate of recurrence.
However, the results of the TAILORx trial show that only 30pc of women with this particular form of early-stage breast cancer benefit from the treatment.
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Chemo and hormone therapy didn't work but this one-time treatment with more personalized immunotherapy did work for Perkins.
The CRCWM is primarily funded by the National Cancer Institute and has between 100 to 150 trials open at any time.
"If it weren't for patients like (ours) throughout the country, we wouldn't know these answers", Yost explained.
After growing billions of these immune cells in the lab, the researchers screened them to find which ones would most effectively find and destroy the woman's cancer cells by recognising their abnormal proteins. Data on incidence rates of breast cancer from six major cancer registries of India show that the annual percentage increase in the incidence of breast cancer has been in the 0.46 to 2.56 per cent range.
In some cases, the results will go on to change how patients are treated.
"At lot of works needs to be done, but the potential exists for a paradigm shift in cancer therapy - a unique drug for every cancer patient - it is very different to any other kind of treatment".
And while celebrating this genuine advance, we should remember just how far we have to go in finding effective therapies for metastatic breast cancer, and other breast cancer subtypes for which treatment options are still limited.
It provides important information on a safe way to cut back treatment, an issue that has prompted vigorous debate not only for breast cancer but also for other malignancies.