Expert Analysis of HER2 Breast Cancer Tests Reveals Issues with Reliability, Mayo Clinic Researchers Say
SAN ANTONIO--(BUSINESS WIRE)--Results for testing breast tumors for HER2 proteins and genes is most often straightforward when one piece of tumor (a single tumor block) is analyzed. However, tumors can be diverse, and researchers at Mayo Clinic found that HER2 results can vary in up to 10 percent of patients when several tumor blocks are analyzed.