The results showed that the clinical treatment score alone was the best for predicting late recurrence, the researchers report. The components of this score include some that are already widely used by doctors, such as whether the cancer has spread to sentinel lymph nodes, the tumour size and grade.
Among the other tests, the PAM50 risk of recurrence score and the Breast Cancer Index score added the most significant prognostic value between years 5 and 10 after diagnosis.
"The most promising new scores from this study are the PAM50 Risk of Recurrence score and the Breast Cancer Index score, both containing different genetic information that are not included in the clinical treatment score and at the moment not routinely measured in clinics," Dr Sestak says.
"Our further interest now lies in the investigation of which individual components of these scores attribute specifically to the prediction of late recurrence, since the Risk of Recurrence and Breast Cancer Index scores consist of several genes and other components. We are now undertaking these analyses and the results will hopefully tell us which genes specifically predict late recurrence. However, at this stage it is not possible to predict response to treatment."
Commenting on the results, Dr Peter Dubsky from the Medical University of Vienna, Austria, noted that oestrogen-receptor positive and Her2 negative breast cancers are prone to late recurrences.
"About half of all recurrences observed within 15 years of follow-up occur five years after diagnosis. Although there is a sustained benefit
|Contact: Vanessa Pavinato|
European Society for Medical Oncology