Fig. 2: Kaplan–Meier curve shows the association between oestrogen receptor (ER) expression and ipsilateral local recurrence rate in patients treated with breast-conservative surgery (horizontal axis: local recurrence- free interval in months, vertical axis: probability of recurrence).
From: The clinical significance of oestrogen receptor expression in breast ductal carcinoma in situ
Number of cases at risk after 15 years becomes smaller for meaningful statistical analysis.
