ERBB2 and breast cancer: The 12 cases that showed this consistent upward trend consisted of 1 HER2+, 1 HER2+/loss, 4 BLC, 4 Lum/loss, and 2 Lum BC subtypes, whereas the 5 inconsistent cases were 1 BLC (case #2), 2 Lum/loss (cases #3 and #17), and 2 Lum BC subtypes (cases #7 and #16).