Table 2

Adjuvant endocrine and chemotherapy by nodal status and center (see Table 1 <$REFLINK> )a Adjuvant therapyMunichbRotterdamc N0N1N0N1 None271 (67.9%)12 (3.3%)1337 (100%)663 (52.0%) Endocrine only69 (17.3%)140 (38.4%)0161 (12.6%) Chemo only56 (14.0%)160 (43.8%)0430 (33.7%) Chemo and endocrine3 (0.8%)53 (14.5%)021 (1.6%) • a See Table 1 <$REFLINK> . Patients with an uncertain number of affected lymph nodes were included for computing the univariate distributions of ranked variables (see “Materials and Methods”) but not in multivariate survival analysis.

• b Three Munich patients with missing information on chemotherapy are not included.

• c 45 Rotterdam patients with an uncertain number of affected lymph nodes are not included.