Do you use breast cancer index (BCI) in patients with 1-3 node positive ER+/HER2- IDC?  

The only clinical case where I would consider ordering a BCI in a female patient with 1-3 positive lymph nodes would be in a postmenopausal woman who is considering to take adjuvant tamoxifen for 10 years vs 5 years based on the aTTom trial (Bartlett et al., PMID 31504126).I do not order BCI in othe...