1808 / 1816
EBCTCG and SEER 1990-2008
Breast cancer mortality
RT vs No RT in pN+ given mastectomy
McGale et al, JCO 2016; 34:3355
SEER data stratified by: age, follow-up year, stage, year, ethnicity,
tumour size, no of nodes, grade, ER status, quadrant, axillary surgery