The MINDACT data from the 2016 NEJM article has a lot of detail, in particular Table 1, which gives the number of subjects in each risk group sorted by clinicopathologic features. There were 638 Her2 positive subjects out of 6693 total, or 9.5%. Of these, 501 (7.5% of total) were ER positive and Her...

There are some medical oncologists using the Mammaprint assay in triple negative patients to help determine prognosis, as the original data set from Denmark was used to determine prognosis and not benefit of chemotherapy. A small T1c triple negative breast cancer with low recurrence score may not ne...