Clinical Trials

Inclusion Criteria:

* Patient must have met the criteria for 1 of the 3 possible cohorts described below:

1. Cohort 1: Previously enrolled on TAILORx (PACCT-1) with recurrence score (RS) 0-100 AND had a biopsy-confirmed locoregional, distant, or both locoregional and distant recurrence prior to registration on this protocol.
2. Cohort 2: Previously enrolled on Step 2 of RxPONDER (S1007) with a recurrence score (RS) of 0-25 AND had a biopsy-confirmed locoregional, distant, or both locoregional and distant recurrence prior to registration on this protocol.
3. Cohort 3: Previously enrolled on Step 1 of RxPONDER and found to have a high Oncotype DX RS 26-100.
* Patient must have been a TAILORx (RS 0-100) or RxPONDER (RS 0-100) study participant who has the ability to understand and the willingness to sign a written informed consent document for participation in this non-intervention study (cohorts 1, 2, or 3). Patients with impaired decision-making capacity (IDMC) who have a legally authorized representative (LAR) or caregiver and/or family member available will also be considered eligible.
* Patient must have tumor tissue available from each cohort as outlined below:
* Patients from Cohorts 1 and 2 must have relapse tumor tissue specimen available at the time of registration for submission to ECOG-ACRIN Central Biorepository and Pathology Facility within 30 days of registration.
* Patients from Cohort 3 must have primary tumor tissue specimen available at time of EA1241 registration for submission to ECOG-ACRIN Central Biorepository and Pathology Facility within 30 days of registration

Exclusion Criteria: