Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Recurrence-free survival curves by tumor grade, estimated by a Cox proportional hazards model with number of positive lymph nodes, progesterone receptor concentration, and tumor grade as predictors. Results are shown for a patient with an average number of positive lymph nodes and progesterone receptor concentration. The model is fit using data from 686 breast cancer patients from the German Breast Cancer Study Group.
