Impact of short-term low-dose tamoxifen on molecular breast imaging background parenchymal uptake: a pilot study

Carrie B Hruska, Katie N Hunt, Amy Lynn Conners, Jennifer R Geske, Kathleen R Brandt, Amy C Degnim, Celine M Vachon, Michael K O'Connor, Deborah J Rhodes, Carrie B Hruska, Katie N Hunt, Amy Lynn Conners, Jennifer R Geske, Kathleen R Brandt, Amy C Degnim, Celine M Vachon, Michael K O'Connor, Deborah J Rhodes

Abstract

Background: High background parenchymal uptake (BPU) on molecular breast imaging (MBI) has been identified as a breast cancer risk factor. We explored the feasibility of offering a short-term intervention of low-dose oral tamoxifen to women with high BPU and examined whether this intervention would reduce BPU.

Methods: Women with a history of high BPU and no breast cancer history were invited to the study. Participants had an MBI exam, followed by 30 days of low-dose oral tamoxifen at either 5 mg or 10 mg/day, and a post-tamoxifen MBI exam. BPU on pre- and post-tamoxifen MBI exams was quantitatively assessed as the ratio of average counts in breast fibroglandular tissue vs. average counts in subcutaneous fat. Pre-tamoxifen and post-tamoxifen BPU were compared with paired t tests.

Results: Of 47 women invited, 22 enrolled and 21 completed the study (10 taking 5 mg tamoxifen, 11 taking 10 mg tamoxifen). Mean age was 47.7 years (range 41-56 years). After 30 days low-dose tamoxifen, 8 of 21 women (38%) showed a decline in BPU, defined as a decrease from the pre-tamoxifen MBI of at least 15%; 11 of 21 (52%) had no change in BPU (within ± 15%); 2 of 21 (10%) had an increase in BPU of greater than 15%. Overall, the average post-tamoxifen BPU was not significantly different from pre-tamoxifen BPU (1.34 post vs. 1.43 pre, p = 0.11). However, among women taking 10 mg tamoxifen, 5 of 11 (45%) showed a decline in BPU; average BPU was 1.19 post-tamoxifen vs. 1.34 pre-tamoxifen (p = 0.005). In women taking 5 mg tamoxifen, 2 of 10 (20%) showed a decline in BPU; average BPU was 1.51 post-tamoxifen vs.1.53 pre-tamoxifen (p = 0.99).

Conclusions: Short-term intervention with low-dose tamoxifen may reduce high BPU on MBI for some patients. Our preliminary findings suggest that 10 mg tamoxifen per day may be more effective than 5 mg for inducing declines in BPU within 30 days. Given the variability in BPU response to tamoxifen observed among study participants, future study is warranted to determine if BPU response could predict the effectiveness of tamoxifen for breast cancer risk reduction within an individual.

Trial registration: ClinicalTrials.gov NCT02979301 . Registered 01 December 2016.

Keywords: Background parenchymal uptake; Molecular breast imaging; Tamoxifen; Tc-99m sestamibi.

Conflict of interest statement

Ethics approval and consent to participate

This study was conducted under approval of our Institutional Review Board and was in compliance with the US Health Insurance Portability and Accountability Act. Informed written consent was obtained from all participants.

Consent for publication

Not applicable

Competing interests

CH and MO receive royalties for licensed technologies per agreement between Mayo Clinic and CMR Naviscan, a manufacturer of molecular breast imaging systems. All other authors declare that they have no competing interests.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Figures

Fig. 1
Fig. 1
Quantitative BPU measured on pre-tamoxifen MBI and post-tamoxifen MBI for women taking 5 mg tamoxifen per day and 10 mg tamoxifen per day for 30 days
Fig. 2
Fig. 2
Mediolateral oblique views of the right breast from mammography (a) and MBI (b, c) obtained in a premenopausal study participant taking 5 mg tamoxifen per day for 30 days. The pre-tamoxifen MBI image (b) obtained on the first day of her menstrual cycle shows moderate background parenchymal uptake (BPU) with quantitative BPU of 1.9, corresponding to the areas of fibroglandular tissue on the mammogram. The post-tamoxifen MBI image (c), also obtained on the first day of menstrual cycle, shows minimal to mild BPU, with quantitative BPU of 1.3, a 31% decline from the pre-tamoxifen MBI

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