Most studies have shown no clear difference in behavior from usual invasive breast carcinoma
One study, strictly applying the criteria outlined here, found a significantly better prognosis for apocrine carcinoma compared to infiltrating ductal carcinoma NOS (Japaze 2005)
Overall six year survival 72% vs. 52%
Grade 3 overall six year survival 83% vs. 51%
Another study, not using these criteria, found decreased lymph node metastases and decreased lymphatic invasion (Tanaka 2008)
