ERBB2 and neoplasm: Patients in the No-Chemo group presented with higher percentage of widows (34.8 vs. 8.1%), older age (age > 70; 58.6 vs. 16.2%), higher white population (81.5 vs. 74.1%), lower histologic grade (I and II; 29.3 vs. 14.7%), higher percentage of stage I (32.6 vs. 19.7%), smaller tumor size (T0/1; 34.3 vs. 23%), more negative axillary lymph nodes (N0; 88.1 vs. 72.1%), more HER2 negative (97.8 vs. 92.6%), and less radiation (33.4 vs. 54.7%) (all p < 0.05) compared with those in the Chemo group.