Background—Understanding of cancer outcomes is limited by data fragmentation. We
analyzed the information yielded by integrating breast cancer data from three sources:
electronic medical records (EMRs) of two healthcare systems and the state registry. Methods—
We extracted diagnostic test and treatment data from EMRs of all breast cancer patients
treated from 2000–2010 in two independent California institutions: a community-based
practice (Palo Alto Medical Foundation) and an academic medical center (Stanford …

BACKGROUND Understanding of cancer outcomes is limited by data fragmentation. In the
current study, the authors analyzed the information yielded by integrating breast cancer data
from 3 sources: electronic medical records (EMRs) from 2 health care systems and the state
registry. METHODS Diagnostic test and treatment data were extracted from the EMRs of all
patients with breast cancer treated between 2000 and 2010 in 2 independent California
institutions: a community‐based practice (Palo Alto Medical Foundation;“Community”) and …