That's a really important question, and it's great that you're paying close attention to your labs. With ER/PR+ breast cancer, high estradiol levels are a genuine concern worth discussing urgently with your oncologist.
Since your cancer is fueled by estrogen, persistently high estradiol (679 pg/mL is significantly Show Full Answer
That's a really important question, and it's great that you're paying close attention to your labs. With ER/PR+ breast cancer, high estradiol levels are a genuine concern worth discussing urgently with your oncologist.
Since your cancer is fueled by estrogen, persistently high estradiol (679 pg/mL is significantly elevated) while on tamoxifen may suggest the medication isn't fully controlling estrogen's effects in your body. This could potentially affect long-term recurrence risk. Some key concerns your care team will likely want to evaluate include:
- Recurrence risk — High circulating estrogen can continue to stimulate any remaining ER+ cells
- Tamoxifen effectiveness — Your dose or medication type may need reassessment
- Uterine changes — Tamoxifen already carries a small risk of endometrial changes; high estrogen adds another layer to monitor
- No period — This doesn't necessarily mean low estrogen, as your labs clearly show
Your oncologist may consider switching to or adding an aromatase inhibitor (like letrozole, anastrozole, or exemestane), which directly reduces estrogen production rather than just blocking its receptors.
Please don't adjust or stop tamoxifen on your own — bring these lab results to your oncologist as soon as possible.
May 7
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