Abstract PO3-12-05: Patient (pt)-provider communication challenges about side effects/toxicities from metastatic breast cancer (mBC) treatments

Abstract Introduction: Treatment decisions for ER+/HER2- mBC may be influenced by pt knowledge about treatment side effects, which is shaped by pt-provider communication. We conducted a survey of pts with ER+/HER2- mBC to better understand pt expectations and experiences of treatment toxicities, the extent they were discussed by the pts’ medical team (MT), and the sources/types of side effect information pts prefer. Methods: The 55-question, online ESR1 QUAlity of Life Survey 3 (EQUALS 3) survey was emailed to US pts from the Cure Media Group and authors’ contacts, and posted to private BC Facebook and Twitter pt groups for 2 weeks in June 2023. Eligible pts had ER+/HER2- mBC and reported changing treatments due to progression. Pts received a $10 gift card at survey completion. Survey answers were descriptively summarized. Results: 213 pts completed the survey; they were < 60 yrs of age (77%), White (44%) or Hispanic/Latino (48%), peri-/postmenopausal (54%), and urban-area residents (51%); and had college education (71%) and household income >$50K (66%). Most pts were on 2nd (36%) or 3rd+ (51%) therapy lines. Current mBC treatments were endocrine therapy ± targeted agent (70%), antibody-drug conjugate (8%), chemotherapy (11%), and others (10%). Most pts’ oncologists were female (65%), BC specialists (51%), and from an academic hospital (61%). Only half (49%) of surveyed pts felt extremely/very comfortable discussing side effects with their MT. Although 86% felt well informed about treatment toxicities, MTs did not proactively ask about pts’ greatest concerns on side effects for 15% of pts, nor about what side effects pts would find tolerable or intolerable for 25%. Oncologist/MT inquired about acceptability of side effects most often with treatment change (25%) or when brought up by the pt (20%), and at every single visit for only 19% of pts. Most pts felt extremely prepared for treatment toxicities (78%) and well prepared to manage them (86%), but 19% of pts still felt that their MT did not provide optimal guidance on managing potential side effects. Pt-centered conversations were most often missing: what rare but serious side effects to expect (44%), how to deal with potential side effects (39%), and what common side effects to expect (32%). Pts also reported that the likelihood of experiencing side effects (40%), what rare but serious side effects to expect (39%), and how to deal with potential side effects (28%) were not well presented. To facilitate treatment decisions, pts would like more time discussing treatment options (48%) or side effects (39%); additional written or visual resources on side effects (29%, 23%, respectively) or efficacy (39%, 8%); and the ability to ask questions and receive meaningful answers (39%), talk to other pts (20%), or listen to videos of their stories (11%). Pt testimonials (45%), toxicity descriptions/examples (42%), and toxicity management strategies (36%) were the most common additional forms of information that pts would like to have had on side effects. Conclusion: In this survey of pts with ER+/HER2- mBC, not all pts were comfortable discussing treatment toxicities with their MT, but MTs are mostly addressing side effects. However, there is still room for communication improvement and additional forms of toxicity information are needed for optimal decision-making. Despite generally feeling well prepared for toxicities, a significant proportion of pts report that the range and specifics of side effects and how to manage them were missing or not well presented in MT discussions. This survey highlights the need to improve both provider and pt education with the goal of effectively communicating toxicity specifics of mBC therapies, as well as the need for standardized pt education tools detailing risks and benefits of mBC therapies to assist pts in shared decision-making conversations. Citation Format: Sarah Sammons, Jane Meisel, Timothy Pluard, Kelly Shanahan, Fumiko Chino, Dario Trapani, Dominic Carroll, Monica Kozlowski, Elizabeth Attias, Nicole Kuderer. Patient (pt)-provider communication challenges about side effects/toxicities from metastatic breast cancer (mBC) treatments [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 PO3-12-05.