Abstract:
Importance:Aromatase inhibitors (AI) are associated with significant urogenital atrophy, affecting quality of life and drug compliance. Objective:To evaluate safety of intravaginal testosterone cream (IVT) or an estradiol-releasing vaginal ring (7.5 μg/d) in patients with early-stage breast cancer (BC) receiving an AI. Intervention was considered unsafe if more than 25% of patients had persistent elevation in estradiol (E2), defined as E2 greater than 10 pg/mL (to convert to pmol/L, multiply by 3.671) and at least 10 pg/mL above baseline after treatment initiation on 2 consecutive tests at least 2 weeks apart. Design, Setting, and Participants:Postmenopausal (PM) women with hormone receptor (HR)-positive stage I to III BC taking AIs with self-reported vaginal dryness, dyspareunia, or decreased libido were randomized to 12 weeks of IVT or an estradiol vaginal ring. Estradiol was measured at baseline and weeks 4 and 12 using a commercially available liquid chromatography and tandem mass spectrometry assay; follicle-stimulating hormone levels were measured at baseline and week 4. Gynecologic examinations and sexual quality-of-life questionnaires were completed at baseline and week 12. This randomized noncomparative design allowed safety evaluation of 2 interventions concurrently in the same population of patients, reducing the possibility of E2 assay variability over time and between the 2 interventions. Main Outcomes and Measures:The primary objective of this trial was to evaluate safety of IVT or an estradiol vaginal ring in patients with early-stage BC receiving an AI; secondary objectives included evaluation of adverse events, changes in sexual quality of life using the Cancer Rehabilitation Evaluation System sexuality subscales, changes in vaginal atrophy using a validated 4-point scale, and comparison of E2 levels. Results:Overall, 76 women signed consent (mean [range] age, 56 [37-78] years), 75 started treatment, and 69 completed 12 weeks of treatment. Mean (range) baseline E2 was 20 (<2 to 127) pg/mL. At baseline, E2 was above the postmenopausal range (>10 pg/mL) in 28 of 76 women (37%). Persistent E2 elevation was observed in none with a vaginal ring and in 4 of 34 women (12%) with IVT. Transient E2 elevation was seen in 4 of 35 (11%) with a vaginal ring and in 4 of 34 (12%) with IVT. Vaginal atrophy and sexual interest and dysfunction improved for all patients. Conclusions and Relevance:In PM women with early-stage BC receiving AIs, treatment with a vaginal ring or IVT over 12 weeks met the primary safety end point. Baseline elevation in E2 was common and complicates this assessment. Vaginal atrophy, sexual interest, and sexual dysfunction were improved. Further study is required to understand E2 variability in this setting. Trial Registration:clinicaltrials.gov Identifier: NCT00698035.
journal_name
JAMA Oncoljournal_title
JAMA oncologyauthors
Melisko ME,Goldman ME,Hwang J,De Luca A,Fang S,Esserman LJ,Chien AJ,Park JW,Rugo HSdoi
10.1001/jamaoncol.2016.3904subject
Has Abstractpub_date
2017-03-01 00:00:00pages
313-319issue
3eissn
2374-2437issn
2374-2445pii
2580714journal_volume
3pub_type
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