Abstract
Background: None of the key randomized trials on the omission of axillary lymph node dissection (ALND) in sentinel lymph node (SLN)-positive breast cancer have reported external validity, though results indicate selection bias. Our aim was to assess the external validity of the ongoing randomised SENOMAC trial by comparing characteristics of Swedish SENOMAC trial participants with non-included eligible patients registered in the Swedish National Breast Cancer Register (NKBC).
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