Clinical and Histological features of pN0 early stage breast carcinomas according to histological grade and to Genomic Grade Index.

HG: histological grade. GG: Genomic Grade. IDC: Infiltrating Ductal Carcinoma. ILC: Infiltrating Lobular Carcinoma. MI: Mitotic Index. Low MI, MI<20. High MI, MI> = 20. ER: Estrogen Receptor. PR: Progesterone Receptor. Chi-square test, Fisher exact test, Student's t-test p values as adapted. *pvalue in the four groups. **p value in the group of histological grade II tumors only. HGI GG-EQ, HG-1 GG-3, HG-3 GG-EQ and HG-3 GG-1 samples are excluded from this table.