ERBB2 and neoplasm: The difference in tumor biology in terms of “luminal vs. nonluminal,” “luminal-like vs. Her2-like vs. basal-like,” and “luminal-A-like vs. luminal-B-like vs. Her2-like vs. basal-like” for the three-group (p = 1, p = 0.93, and p = 0.79, respectively), two-group (p = 0.97, p = 1, and p = 0.61, respectively), and in-group (p = 1, p = 0.80, and p = 0.79, respectively) comparisons did not reach significance.