Overall health at diagnosis predicts the risk of complications within the first year after breast cancer diagnosis.

Purpose: Breast cancer patients with overall poor health are at a greater risk of both complications during treatment and mortality from competing causes. We sought to determine the association of pre-existing comorbidities on treatment-related complications and overall survival.

Methods: We identified women ages 40-90 years old from our institutional registry with stage I-II invasive breast cancer from 2005 to 2014.