GATA3 and breast cancer: The rate of GATA-3 positivity shows little change in both primary and metastatic breast cancer.[28] A study that compared the value of GATA-3, mammaglobin (MGB), and GCDFP-15 for pathological diagnosis of breast cancer reported a positive rate for GATA-3 (92.5%; 94.25%) that was significantly higher than that for MGB (42.11%; 29.17%) and GCDFP-15 (55.77%; 31.34%) in primary or metastatic breast cancer.