How representative is a lymph node biopsy from the axilla in a node-negative breast cancer patient?

@article{Hartveit1981HowRI,
  title={How representative is a lymph node biopsy from the axilla in a node-negative breast cancer patient?},
  author={F M Hartveit},
  journal={Clinical oncology},
  year={1981},
  volume={7 4},
  pages={303-9}
}