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Data Elements for “Time to Initiation of Primary Breast Cancer Treatment” Calculations
| Time period | Date of |
|---|---|
| Time 0 | First definitive tissue diagnosis (i.e. biopsy) |
| Time 1 | First definitive treatment, including any of the following: |
| definitive surgical procedure (lumpectomy or mastectomy) | |
| external radiation therapy session, neoadjuvant chemotherapy infusion, prescription for neoadjuvant hormone therapy | |
