Do you need to wait for estradiol and FSH levels to normalize before you can switch from tamoxifen to an AI for a pre-menopausal woman with ER+ breast cancer?

Since tamoxifen can also affect hormone levels, it is prudent to hold tamoxifen for a month before checking hormone levels. In this case, it is reasonable to stop tamoxifen due to endometrial thickening. One could consider checking hormone levels after a month of stopping tamoxifen and if they are i...