I have entered your data in Adjuvant!
Online and from the output, your chance of survival and being
free of recurrence is 79.9% in 10 years (which is pretty good). The addition of chemotherapy will increase that probability by another 5.9% using standard chemotherapy (6FAC, or AC-Taxane). It is a small increment but it is still a significant jump in your chances. Hope this helps. Regards and God bless.