To define a subgroup of patients in whom axillary lymph node dissectio
n could be omitted, 111 patients with an impalpable invasive breast ca
rcinoma were studied. The records of these patients were reviewed for
pathological axillary lymph node status, age, menopausal status, clini
cal nodal status, findings on mammography and tumour characteristics s
uch as tumour size, tumour grade, mitotic activity index, receptor sta
tus, and lymphatic and blood vessel invasion. Twenty-two per cent of t
he patients had lymph node metastases. Age and tumour size were signif
icantly correlated to pathological nodal status.