Abstract PO4-11-11: Provider perceptions of the POSITIVE trial, endocrine therapy interruption, and fertility preservation

Abstract Background: Fertility preservation and family planning are pressing survivorship concerns for many young, reproductive-aged women with hormone receptor-positive (HR+) early-stage breast cancer. Following primary treatment, patients typically receive 5-10 years of adjuvant endocrine therapy (ET), during which pregnancy is contraindicated and fertility may decrease. The first-of-its-kind POSITIVE trial (NCT02308085) sought to challenge this archetype by prospectively evaluating the impact of temporary ET interruption to allow patients to attempt conception. Participants (n=516) received 18-30 months of ET followed by a 3-month washout period prior to initiating a 2-year break from therapy to attempt pregnancy. Results demonstrated that short-term disease outcomes were not impacted by temporarily pausing therapy to allow women who desire conception to attempt pregnancy. This survey-based study aimed to evaluate community oncologists’ perceptions of the POSITIVE trial data, ET interruption, and fertility preservation efforts. Methods: US-based oncologists convened at three live meetings in March and April 2023 to review clinical updates presented at SABCS 2022. Participant characteristics and demographic data were collected via an online survey prior to the respective meetings. Perceptions/reactions to clinical updates were captured using audience response system technology. Data were summarized using descriptive statistics. Results: Among 157 respondents, 82.8% identified as community providers, with 17.9 mean years of clinical experience. On average, participants reported that 85.4% of their time is allocated towards direct patient care, with approximately 21 patients seen per clinic day. Most respondents (85.8%) indicated that they only refer patients to a fertility specialist if the patient initiates fertility preservation discussions and nearly half (45.7%) reported that within the last year, 20% or less of their patients have discussed fertility concerns with them prior to initiating therapy. Additionally, over three-quarters of respondents (79.9%) indicated that 10% or less of their patients with breast cancer underwent fertility preservation within the last year. Prior to reviewing the POSITIVE trial data, 51.3% of respondents reported that they would be most likely to offer therapy interruption to patients with low- or intermediate-risk disease, while 19.8% would do so for all patients regardless of risk status. After reviewing the POSITIVE trial data, 59.3% of respondents would offer therapy interruption to patients with low- or intermediate-risk disease, while 30% would do so for all patients regardless of risk status. Notably, a majority of respondents (54.8%) indicated that they would recommend a therapy interruption of 12 months or less, while 11.1% would opt for 19-24 months. Conclusions: Findings demonstrate that the onus of initiating discussions surrounding fertility and reproductive topics is often placed on patients, and many patients do not proactively address these matters or undergo fertility preservation prior to initiating treatment. Overall, respondents viewed the POSITIVE trial favorably, as evidenced by their increased willingness to consider temporary ET interruption for all patients following their review of the study data. Although the POSITIVE trial allowed up to 2 years of therapy interruption, respondents preferred a treatment break of 12 months or less. With the adoption of the POSITIVE strategy into routine clinical practice, younger women with HR+ breast cancer may no longer be faced with the difficult choice of pursuing potentially life-saving therapy or starting/expanding a family, thereby addressing a current unmet survivorship need among this patient population. However, it remains to be seen how many physicians will offer this approach, who is the ideal candidate, and what the appropriate ET interruption length will be. Citation Format: Brooke Leon, Robert Bone, Yolaine Jeune-Smith, Sigrun Hallmeyer, Bruce Feinberg. Provider perceptions of the POSITIVE trial, endocrine therapy interruption, and fertility preservation [abstract]. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO4-11-11.