Advanced age (HR 1.05 per additional year, CI [1.03-1.08]), negative progesterone receptor (HR 2.17 [1.35-3.45]), SLN metastasis (HR 1.69 [1.03-2.79]), and only one SLN identification technique (HR 4.14 [1.21-14.18]) were associated with lower survival.
Analysis of the expression of estrogen receptor (ER), progesterone receptor (PR), human epidermal growth factor receptor 2 (HER-2), and Ki-67 in pure DCIS (164 cases), and DCIS with microinvasion (55 cases) using immunohistochemistry.DCIS with microinvasion had a higher nuclear grade (P < .001) and was more likely to have sentinel lymph node biopsy (SLNB) positivity (P = .039) than DCIS.