A previous study found expression of this enzyme involved in hyaluronan synthesis in 72.7% of patients with MpBC, compared to only 56% of patients with invasive ductal TNBC, and 25.2% of patients with invasive ductal carcinoma of ER, PR, or HER2-positive phenotypes [30]. The gene discussed is ERBB2; the disease is invasive ductal breast carcinoma.